Russia does not only leave their own people behind but actively send more to die.
Of course, there will be some limit how far they can go. It is expected that at some point there will be a new leader who will intervene and stop these senseless killings of their own people.
A new leader whose first action is to lose a war? I wonder how long he gets to live.
When you just stop the military action it is called a "ceasefire" and requires agreement of both sides. We might see that eventually. Just leaving the land (and people) that, as you have said, people has died for, and doing that for nothing - I don't see how that could be popular. I also fail to see how it may be a good bargaining point. When you give anything in advance you have less stuff to bargain with.
Putin lost the war. A new leader would be a man of courage to say that clearly. And he would lead the country to prosperity instead of more killings and stagnation.
Who needs your prosperity promises if you turn 5 million of their compatriots into refugees, captives, or worse? Russians've seen that kind of "prosperity" in the 90s and I don't think they're going to fall for this one more time.
If you think Ukraine have won the war, let's see how they arrange the life on all the lands that they have already reclaimed.
No one is going to fall for the promises of the USSR system, that's for sure.
5 million Ukrainians already run away from it. I think they are doing great, much better than those who stayed in a war zone (where many were brutally tortured or killed). As soon as the war ends, many of them will come back. In fact, many are already returning.
Of course, there will be some limit how far they can go. It is expected that at some point there will be a new leader who will intervene and stop these senseless killings of their own people.