with the caveat that this same point and a dozen counter-points have no doubt already been made, be careful what you wish for?
is there any team bought by Americans that has actually demonstrably benefited? they might just lose interest once they learn that you can't buy up all the local politicians in order force taxpayers into subsidizing new stadiums every 20 years, or collude to keep player wages down, as is standard practice on the "free" market. the best case scenarios have seen preposterous spending on limited players, mountains of debt from the initial purchase loaded onto team accounts, and burning effigies.
the question isn't just would be better off with a yank deus ex machina but also are we better off now than we would be with the lot that run villa or sunderland... or even the Indian chicken peddlers at blackburn.
if we ever do get bought up, the odds of things getting much worse have to be at least even, if the rest of the division and not particularly short list of teams no longer in the top division suggest.