The problem is that the current concept does not provide adequate war stocks. The second problem is that there is only so much money to go around. There needs to be a program that both allows the cycling of older but still useable vehicles into war stocks while new vehicles are introduced in a logical plan that is both economical and sustainable.
The concept of "we need a common fleet to simplify maintenance and repair" hasn't worked for us in peacetime (see the previous year's VOR rates) and will leave us incapable of sustaining anything more than a battlegroup in wartime. And that is ludicrous.
If anything that Ukraine teaches us about sustainment in battle it is that you need to be able to and can in fact sustain a wide variety of equipment. Sometime it just gets used 'til it wears out or breaks and then you coble something together or let it sit in a field. Stuff gets grouped in brigades for as much commonality as you can. We can do that as well. I see three tiers of equipment - 1) front line deployed formations and Canadian-based training and replacement formations; 2) Canadian formations for domestic operations; 3) A territorial home guard. Those can, and probably will have different sets of green fleets which may, in part, be hand-me-down fleets.
The CAF has to get out of the rut of just thinking about its full-timers - what has now become 1 Div - and seriously plan for what 2 Div will become and need and, more importantly, what the expanded war-time army will need. - and that needs to include a greatly expanded, more versatile log and maint structure.