It always felt that as you play the game you end up having less and less to do. I think FFxiv would shine if old content (raids and trials) could be enjoyed like how it felt the first it came out.
When new players join the game, they are basically getting carried through the entire game without really feeling what is like to struggle on the content they are running. Now I know what level sync, is but wouldn't it be nice if people could farm they old trials and raids for gear that could potentially be used on new tiers of raid? This way they entire game is current and instead of just running roulettes people actually join statics for old raids like Alexander/coil.
A good implementation of this is the ultimate raids, where no matter how high you are on Ilevel, you will sync as soon as you step on the floor. Why not doing this with the entire game so new folks can enjoy it with a touch of difficulty.
Again this is just my opinion.