[usrn]

I'd imagine what you'll really have is a primary tank with a human "field support" technician/operator and a bunch of unnamed machines that are at the front doing most of the physical fighting. Humans are expensive and Russia (most Western countries really) was already suffering from a shortage of young workers.

I'd be shocked if canons went away though. The end goal of warfare is to cause enough chaos/destruction that your enemy's choices are constrained to what you want. Without physical violence there's no sense going out into the field in the first place.