This seems mostly right, but I want to add a few points.
The first is that the Ukrainians won’t stop fighting if the west stops supporting them. They may suffer some severe defeats and the nature of the war may shift to being more of a guerrilla insurgency, but they won’t stop fighting.
The second is that even if the US withdraws support, it’s not likely that European nations will necessarily follow, and between Germany and the UK and France, the Europeans can easily continue to support Ukraine at or above current levels.
My final point is that Ukraine actually is making slow progress in pushing back the Russians, it’s just not going anywhere near as fast as anyone would like.
I also really dislike the term “stalemate” because it implies a static state of affairs as in a chess game where there are only so many pieces and moves, when in fact war is much different in the sense that additional pieces and moves can and probably will be added to the equation.