Unfortunately, I think Putin is willing to sacrifice a lot of innocent Russians, and because how the culture/history/media censorship of Russia is, the population is not going to uprise. I think they will take the suffering of the sanctions and the lives lost in the war as part of "being Russian", like it is a natural law or simply the destiny of the Russian people, always to suffer.
It seems slightly absurd that the Russian state could censor the Internet so effectively or that every Russian only watched TV (and there was only the State channel 1 and 2 or something); I suppose the lack of freedom of speech and print and imprisonments or murders of dissenters keeps people in line?
It's a bit like Hong Kong, once China decided enough is enough and imposed new "security" laws with record speed and started arresting people ..well I haven't read about mass protests there lately. If the state is draconian and democracy is a swearword I suppose only the government matters. Then again there are people like Navalny and Nemtsov