I like your ideas, but more and more suggestions that I see for this game are ways to make the game MUCH easier, not much better. (imo)

I'm sure to some people easy game = good game and challenging game = waste of time but I for one, did not choose FFXI because it was seen as an easy option.

Bring skills back to Campaign! Yeah, there's plenty of mobs there, it can be tough for solo DD jobs yeah, but you're there to skill, not to get EXP. Waiting around for the fights is a good thing in regards to skilling up. The "super-easy-mode" style of the OP's idea means you can essentially walk into a gym and press a "max skills" button. If you have to wait around or be unlucky getting tags just as the campaign finishes a few times then so be it.

Again, OP's idea is a nice idea but no room/need for it in FFXI. Plenty of other places to skill up, SE have even put newer mobs in older zones to help with this too and of course there's Abyssea EXP parties, just get yourself in one of those and skill away.

PS: There is 1 awesome way to avoid getting VERY behind on your skills by the way guys........... STOP ABYSSEA LEECHING 30-90! :P