Yeah, this dude may have made a big misstep.
If we are to see the kind of resolution to "The Putin Problem" that doesn't involve nukes on American soil, it might just come from his own people finally having enough of him. He will never go quietly, and that's sad for the Russian people... but at least it would be them taking him out. He'd never drop a nuke on his own land.
There are a lot of different ways this could play out, both long- and short-term.
Putin paying for overstepping is a distinct possibility.
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IMO, the Russian people rising up against Putin would probably be the "best" case scenario here.