I'm in total 100% agreement with OP. I have two suggestions...
Blitzball!
Blitzball tournaments? We can even watch people play on the sidelines and stuff, have bets on which team will win and all that fun stuff.
Watch players grow and have fun and relax. Please if they DO add this, don't make this a friggin' ridiculous grind and crap.
Crafting and Gathering: can be more fun if... we need FATE's or something fun for them too.
Have cute events like a wedding, you can craft/gather things for picnic's or parties and stuff like that, and it'll be fun to gain EXP like that as well.
Get the people who enjoy C&G more things to do!
Some stuff hidden here so people don't have to scroll a lot.
I feel like the problem with 'on the side' content is they make it a huge ass round about.
Glamour: you have to be 50 to look pretty...why? Also costs ALOT to glamour.
Housing: is a big ass joke, the biggest joke of them all. 1% of the game has a house...and I remember seeing a topic where a guy had 6 houses for the hell of it.
Then they proceed to release BS furnishings while I'm chilling with Hobo the Clown in Ul'dah because I ain't got no house.
Chocobo Racing: Takes waaaaaaaaaaaaaaaaaaaay too long to level.
Your Chocobo friend: WAYYYYYYYYYYYYYYYY too long to level, and the fact we can't use them in PT's sucks butt. I used him the entirety of my HW from 50-60 AST and he level'd once...and he already halfway.
Triple T: is annoying because of ridiculous NPC's and rules imo and takes hours upon hours to beat and not get a damn card.
SightSeeing log: Personally don't like it because of the weather thing I have to keep looking out for.
The end-game is bad. It's really bad people. I'm 3 days til' I'm out of my sub and I may run one more course then I'm done til 3.1.
SE cannot make fluff content just that. Oh no! It has to be an arm, a leg and your first born son type of thing.