I'm assuming most people just want SMN to be like FFXI's because of the large summons. We already have two big Demi summons, just let it be known to the dev team that people want more. That and/or ask for Egi summons to be reworked in gameplay and appearance because they're still bad. There's hope for SMN thematically with Bahamut, then they improved upon it even more with Pheonix letting you use Phoenix-themed attacks. I just hope the summoning aspect gets improved upon and becomes more frequent in the future.

Other than that, this is incredibly unrealistic. They won't redesign the job entirely from scratch. For gameplay in particular, in my opinion SMN became better and better as expansions go but flopped in ShB, although it still shows promise. The gameplay is fine...or was, but can totally be fixed. If you hope for a rework, they won't stray from the basic fundamentals of its current design.