This worked well for them subjectively in terms of social acceptance within America (nobody much cares, or even notices, that the Democratic Senate majority leader, Harry Reid, is a Mormon).
Or, feeling rejected as a people, will Mormons go off in a new, subversive direction of ... what?
Mormons aren't a huge group (usually said to be about 9 million). And they aren't hugely talented. They generally seem to be about the white American average -- but that puts them increasingly above the American average. And they are better organized, more cohesive, and less dysfunctional than most. So, if they move in a particular direction, it could be moderately significant.
The most likely reaction would probably be to modernize by accelerating the Third Worldization of Mormonism. That would be the easy, socially acceptable path. But that way leads to irrelevance because nobody cares much about nonblack nonwhites, especially ones who choose to assimilate into polite Mormonhood rather than riot over YouTube videos.
Perhaps, though, there are other, more unexpected directions that insulted, alienated Mormons could turn. I don't know enough about them to guess what those might be, however.