It's not that they will run out of people. They have people, but to keep recruitment levels so high and equipment manufacturing so high they are overcharging their economy. Right now in Russia there are three types of jobs if you want to make money afaik, work in the military complex (arms manufacturing), in the gas extraction industry or directly in the military.
It's Dutch disease x100, if the state at some point stops being able to fund the war machine, their economy collapses.
I mean, considering his pettiness, probably. Either with carrot or stick, he wants to be heard and wants people to bend over backwards to gain his approval. In exchange, he might do a tax cut or two for those who manage to please him, while he'll try to crush those who oppose him.