Poland and Baltics are most likely to get shoved off a cliff, but fundamental problem that NATO has right now is lack of industrial capacity. These small countries can provide men to be sacrificed, but US is the only major weapons producer in the west, and it's simply not able to keep up right now. Obviously, US could start developing domestic industry, but that's going to take years to do.

US is also in a political turmoil now the likes of which have never been seen. The country is very divided internally, and the tensions are rising, and economic situation is worse now than it was during the great depression. This creates a ripe environment for opportunists like Biden and Trump to take charge, and the administrations these clowns run aren't able to solve the problems US has. Even in regards to the war there's a lot of infighting because there's a neocon camp that thinks this is a distraction from China. The worse things get the harder it becomes to justify keeping the war going domestically.

Russia has a huge advantage in this regard because it has a stable government that's able to do long term planning and the industry that was inherited from USSR that can produce the weapons and ammunition needed to keep the war going.