x-men days of future past casting

....So, apparently, aron ashmore will be play once again Iceman in the incoming movie (which should be both a seuqle to the original trilogy, to first class and a seuqel to X3, as, if it will follow the original story in the comic books, will involve time travel). I don't know if I should be happy, because I just loved him as Bobby, or worried. I wouldn't wnat for his character in the following to die or being "erased" because he ahs accepted to film the movie.
Oh well. just in case, there is also his twin brother shawn. after all, they "exchanged" roles in the past when one of them was having troubles shooting scenes, so, why not again?