IMHO there's no reason to fix what isn't broken. But in vein with what you're saying, it'd be really nice to see some entirely new classes with good staying power introduced. Series staples can be started in later games too. I don't mean like the new ones they already have - the Armory System is just that - an Armory System; it's your weaponry and weapon skills - but some more of those would be nice too.

Though I think they shouldn't bother with it until they've got the classics in working order. One step at a time and all...