Putin has made it so he has an unlimited ability to mobilize. It's all based on how far he can push the different means of mobilization.
Before the election they kept id "modest" at about 1000 per day, but there are speculations that Putin could be able to mobilize 500000 personnel in a short time if decides to.
So Russia definitely has the means to sacrifice more if needed, the question is how much the Russian people is willing to accept. Because even with falsified information, the mobilizations and deaths and wounded can't be kept secret forever even with the best propaganda.
I keep hoping that all we are waiting for is the straw that breaks the camels back. But although it's been buckling for a while in many ways, it seems it simply wont quite break.