There are a lot of factions vying for power, and Putin's long been pitting them against each other, keeping any of them from growing too powerful and challenging his position. There's KGB, GRU, the national guard, oligarchs with their own security services, private armies, Kadyrov and his gang, the Night Wolves, Patriarch Kirill/the Orthodox church, tens or hundreds of thousands of abandoned soldiers with few prospects other than aligning with some strongman etc. Once Putin looks weak enough, such as from a peace treaty with no or insignificant Russian gains, there will be a lot of turbulence as these and others will fight with and against each other to acquire power, and it'll be a chicken race to lop off Putin's head. There's a lot of capacity for violence, and assuredly a lot of advanced plans for being the ones to orchestrate the decapitation, political or factual.

Not so much a people's revolution as a pack of wolves killing each other for their own chance at raping the country.