No - because they will want to promote new characters. Yes - because they will want to promote a new game with a returning character. No - because a new installment of any old franchise they want to promote will have all new characters like Fire Emblem.

Yes - because the best choices for optimal $ will include at least one old one. No - because the best choices for optimal $ will not include an old one. Yes - because they are specifically going to try to mix new and old as a celebration of gaming. Even if not optimal $.