Originally Posted by BMM
The original cast is great for marketing. Their being the focus is not necessary otherwise. It's also incredibly short sighted, if the studio isn't looking to continue using them beyond Days of Future Past.
Well right now, we still don't know what movie are they gonna do after this movie. They could continue with the First Class cast or continue with the original cast. But I think, the original cast is more appealing to casual viewers and if FOX is smart and if they want their movies to be really successful and earn more money than the previous X-Men movies, they should just continue with the original cast after this movie.