The truth is, if we change this into a european style government, it's death will just be accelerated. There aren't enough euros here to keep it going, and frankly we Americans are lazy and won't care to learn the new rules.
I don't think we've had an "American" system for seven years.
I mean, really, what is "American" about the Atlasian system? We have a President... who's actually pretty weak. We have a unicameral national legislature. We have regions that aren't cookie-cutter knockoffs of each other, which pretty much have unicameral legislatures (of varying compositions, o/c) and varied executive bodies. Our Supreme Court does almost nothing (at the moment; I've always been impressed by the caliber of the rulings, though). To say that the Atlasian system means that new players have to learn nothing, though, is pretty much a lie.