I don’t think so. There weren’t enough GERMANS to conquer the entire world. I think he was looking for room in Russia - that other miscalculation - where he thought France and UK would back off - indicates his real intentions.
But, even he did, we had a bit of time before he’d be able to stage an invasion of the US... Something about not having much of a navy outside the Ubootwaffe.
True, but remember, Hitler had Ukrainians, Romanians, etc. fighting for him. And he had Vlasov's Army potentially at his disposal had he defeated Russia. Some speculate, out of admiration for Stalin, he would have offered Stalin a chance to keep command of a puppet state, though I certainly doubt he would have accepted it. Over time as Nazi Europe became more consolidate, certainly there would also be French troops fighting for the Nazis.