The SAM situation can be resolved overnight. The US just has to fly in a bunch of Patriot missiles from their Euro stocks.
Will the US do that? Lets see.
Your other points are sheer catastrophizing. The Russians are (still) incapable of breaking through, or of operational maneuver.
I thought we were worried about Vlad conquering Europe and threatening the US?
Wait until they try. You got catastrophe right, you better believe.