The main problem with this is that it's attritional simply to hold ground. The mass proliferation of UAVs have made keeping armored assets near the front extremely expensive. It can no longer go back to the 2014 static front stage where losses were manageable for both sides, even with the current snail's pace of movement, I have seen from here and Ukranian footage of dozens of troops getting mauled daily by UAV dropped munition, there are almost always daily videos of armored vehicle losses.It is clear Russia cannot sustain high tempo operation forever, but they don't have to. If Ukraine + western aid run low on equipments, Russian loss will go down, and vice versa. So the question then becomes who is running low first? The war is a race between NATO and Russian war economy. Russia is betting on reduced attrition on vehicle once western aid dwindles.
I believe going into 2024 Ukraine will at least have enough of a lifeline that Russia won't be able to collapse the defense and push for surrender and that makes the war very expensive.