I wouldn't be so quick to discount Ewing. As a British writer, he's less likely than many to embrace an American jingoism, and, if anything if the concept for this series is to suggest, he may be playing it up for story elements and social commentary. I get the feeling that USAvengers is going to be over-the-top, possibly as part of Roberto's master plan, and perhaps claiming that he's always wanted to be American is part of his new "image" as Citizen V.

I mean c'mon, in the same page Ewing references the early New Mutant days in a way few have done for years, right down to the love of Magnum P.I.

Given that the entire previous series was composed of fakeouts, double-agents, secret plans and clever tricks, culminating in an awesome reunion of the New Mutants, I bet this is more of the same and nothing is as it seems on the surface. I'd give him more of a chance than what we see on a single page. Unless you had more issues with him than just this.

And somehow, I doubt we'd ever see any of the others you mentioned deciding to renounce their existing citizenships; it's just not in line with their characters or stories. But for the X-Men, it doesn't feel as out of place for many of them to become U.S. citizens after they've been in America for a while--they seem to claim it as home, y'know? Except for ones like Sunfire, who actually embrace their own nationalism.

I'm adopting the usual wait and see, because Ewing rarely disappoints.