The problem that you face with this is long standing corporate memory. There had been a number of such amalgamations and rationalizations all of which led to reduced manning and capability. When this was floated in the late 1990s in Ontario it ended up with a revolt of the honouraries and direct bickering to the MND and the PM.
I'm not defending that but merely pointing out that there is an underlying division as between the RegF concept of reservists as folks to fill in the blanks on RegF units (which is heavily proven by the equipment holdings of the respective organizations) and the ResF view which is more long term and looking for a force capable of not just reinforcing the RegF but expanding it in time of need. Much of that is resource driven and caused by a lack of political understanding and leadership. Each side is protecting their own vision.
I know you want to break the ResF mafias; but much of the army's problem comes from the fact that it too is a Mafia with it's own sub-mafias which concurrently need breaking.
I've sat at the ResF big boys' table for over half a decade and you probably wouldn't be surprised at how much it feels like the little kids' table. There is very little that you actually get accomplished. Day-to-day you are just being fed info with a fire hose but any initiatives for change inevitably come from the RegF and are generally small order stuff that doesn't address the overriding issue.
I can pretty much guarantee that if we went to a model that greatly reduces the numbers of ResF BGens, Cols, LCols and CWOs, it wouldn't fundamentally change anything. You need to dig deeper than that and have the RegF reform its organizations, equipment policies, administrative policies and a whole hockey sock of other stuff that needs to be done to rationalize the leadership, training and mentoring process to the point where it has some positive effect. This is a whole of Army issue. Asking the ResF leadership to trim itself is asking them to deliver something that they are incapable of. It's like when Leslie was looking at Transformation in 2010/11 and found every department absolutely convinced that there was no way that their department could bear a cut or manage a reform. That's simply how bureaucracies function.
It has to come from a knowledgeable and strong MND supported by his PM with a mandate for meaningful reform and not just cost cutting. It ought to be
the priority. Everyone knows that you need a solid core of full-timers to develop doctrine, practice it and take care of the day-to-day discretionary defence deployments that we choose to take on and at the same time have a larger, well-trained and equipped, low cost part-time force to call on when a problem is no longer discretionary but has to be addressed with a military solution. The CAF is currently focussing on the former while marginalizing the latter.
I agree fully with the basic concept of amalgamation and I know that it works in the US with their ARNG.
Where I would deviate is that I would remove artillery and engineers from the manoeuvre brigades and have them in their own brigades so that these specialty skills could be properly supervised and developed across the entire Army in a consistent and purposeful manner. I would leave the manoeuvre basically as infantry and recce/armour organizations so that they could concentrate on those combined arms skills.
Service support is too important to leave in little enclaves. It's one of the primary needs of an Army that is required to deploy beyond the routine peacetime deployments. A significant effort should go into creating ResF service support battalions and formations that are capable of supporting a brigade or larger deployed force and augmenting smaller RegF deployments. If we do not plan to mobilize a ResF manoeuvre brigade then we do not need a ResF brigade service battalion, just a peacetime, full-time maintenance establishment commensurate with the brigade's equipment holdings. If we do get to the point where we want to mobilize a ResF manoeuvre brigade then we need to have or to be able to rapidly form a brigade service battalion. Regardless, we need to have at least one, better yet two, ResF sustainment brigades.
I'll get back to basics. I've come to the view that both warfighting and administration has become too complex to be handled by a part-time leadership. If we pool the ResF into more concentrated brigades and units (especially if we also reduce the number of division headquarters to a more reasonable two) but maintain the full-time RSS and brigade and division staffs in their current numbers then we already have a start at a core for a full-time leadership/administrative cadre. (That shouldn't stop us from also simplifying our administrative system)
On the other hand, I do not think that is enough. I do not think that amalgamation brings enough experience or equipment to the reservists to allow them to do proper individual and collective training. For that I think you need something in the nature of a 30/70 battalion where you have one CO responsible for training his fully equipped full-time company and his partially equipped, part-time companies using the resources that he is given. Resource sharing and management within a battalion is much easier to accomplish than Army wide. Additionally the full-time company and battalion headquarters is still available for peacetime deployment rotos fleshed out to an extent by it's own reservists.
All that to say that the ResF is in dire need to be fixed but incapable of fixing itself. Not just because it's stubborn or cliquish (which it is) but because it does not have the control over itself or the resources to the extent that is needed to really fix the problem.