The problem with this idea is that the entire game is built around the current system. They would have to cast meteor on the realm all over again to create such changes. Plus I've never had a problem with this system. It makes each class/job more defined and unique compared to others. I wouldn't worry too much about the lack of variety in weapon types right now. Just take a look at XI, the game started with very little jobs but over time the number of unique classes has grown dramatically. And since classes/jobs in XIV are tied to a specific weapon, you can bet there's gonna be plenty of new weapon types in the years to come.