I'll tell you all something right from the coal face. It's where I live. Let's use SW Ontario as an example. Amalgamate units and you're going to lose a lot of people. Including Officers and Snr NCOs. Go ahead and use the axiom that those people weren't worth keeping anyway, which is bullshit, but go ahead. The loss would be bad enough if you took the guidon & badge from one and made them go under another. Then the CO & RSM would have control over say, 3 Sqns, but have to travel all over SW Ontario, three different locations, to show themselves to everyone. You're not talking young piss and vinegar types with families. You're talking old dog eared types that are retired and can afford the time and travel.
So the other option is to keep the units at home but form all the garrison into a single unit. Infantry, Armoured, Svc Btn all one unit. You'll lose even more pers and be no better off than when you stated except instead of having three 100 man units doing different roles, that you can draw on, you'll have one 150 man unit with everyone pissing on each other. Higher up will be jockying for position and the others will see it and follow suit. Unit loyalties will win out.
It'll take years to make a cohesive outfit from this type of mishmash. It ain't pretty and it doesn't fit your pretty little cookie cutter designs, but it's a big elephant in the room that you can't ignore. It also has the largest capability of sewering any plans for roling in units and making your newest Mo experiment work.
Reservists are a fickle bunch and you have to understand how to sell them on the plan, because they are not a bunch of morons without any other means of employment or fall back. Most do it because they like it, not because they need a job. frig with what they like and don't offer a better alternative, they'll vote with their feet.
Whatever is planned, there better be a lot of buy in, consideration, and consultation. Show up and tell them they are all part of the 51st Dog Sled Mushers, here's your new badge, and you've lost before you even start.
Make all the grandiose plans you wish, but if you don't include or get inclusion from, that young troop on the floor, you've simply lost the best asset you ever had.
But hey, what do I know. Just tossing out random thoughts.