The other people? No clue.
I can talk about me. I'd love XP to keep going, at least to a minimum degree, for three main reasons:
1) Because I like it! It's fun! What I hated at lv75 about xp is mostly it took too much time to get a pt and often it sucked, not too count it took way too much grinding to get what you wanted and I didn't have that sort of patience/time
2) Because other people still need it, and the less people look for xp, the harder it is for those who still do to find/assemble a pt. Giving people more reasons to keep doing xp (which is different from FORCING THEM to do it, which I wouldn't want) keeps the cycle going.
3) Because XP was one of the core elements around which old FFXI was based. Game changed and it's ok, but it would be cool if XP could keep a guaranteed spot in nowadays's game balance, even if much smaller than the one it used to have.
That's it.