Russia propaganda will has its citizens believing this is the fight of fights and that it is their duty, their calling to crush the Ukes in order to save Russia. It's just hard to gauge how effective it is on the populace as a whole. I don't think support is as unilateral as it was say in 1940.
Which begs the question we have cycled around since the first days of this. If Putin dies, does the war end? Maybe not over night obviously but eventually?
In response to the sustainment of length of this war. If Putin keeps living it will go on. Absolutely believe that. If something happens to him though…..maybe not?