That's the one thing that would seem to disrupt FFXIV from gaining players that are really into the FF MMOs.
You mean aside from the fact that FFXI is dated and
If SE wants to throw FFXI players a bone and give them a benign furnishing some other such little vanity item that identifies them as a former FFXI player, sure. No harm in that. Beyond that, I'm not really sure what you could really want. I mean, SE would be pretty silly to scan their FFXI player database and start shipping over little Fafhogg trophies or mannequins with FFXI gear your character earned on it so you could sit around and stare at it for hours and pine over the good ol' days instead of actually playing the new game. And of course, I know you wouldn't be so ludicrous as to even propose the idea that your time in FFXI should entitle you to something in FFXIV that actually gives you any sort of significant edge in combat or professions over people who didn't play FFXI (or played but left years ago).
I played FFXI. A lot of the stuff on my character had meaning because of the gargantuan ordeal involved in getting it, not because I had any particular affinity for it. FFXI was also my first MMO and leaving that game was my first stark reminder that yes, all of this stuff is pretty meaningless at the end of the day because one way or another, someday it's going to be gone. Whether it's because you find a new game, the current game just dies off, or your life changes and MMOs no longer fit, sooner or later it's going to be time to say goodbye.