Mr. Yoshi P should consider a future Sephiroth Raid

[Enkidoh]

They won't though, because they only seem to do crossovers events and raids for games that a) need exposure and thus the crossover is actually a form of advertising for the other game, or b) has a direct connection to FFXIV's development or development team. FFVII is neither because it's the game that made Square and the series what it is today and basically prints money just existing. FFXI on the other hand, is FFXIV's MMO predecessor, and is now well and truely in it's Indian Summer, so the FFXI raid is a good way of ensuring Vana'diel will live on when the axe inevitably does fall.

Besides, we already have had some FFVII crossover stuff in the game, but it's far more subtle (Costa del Sol, Gold Saucer, the Lifestream - until the clunky retconning of it's name to 'The Aetherial Sea' in EW - materia, DRK's Victory Pose being Cloud's victory pose, the Guard Scorpion as Ala Mhigo's first boss, FFVII minions, the SDS Fenrir mount, Cloud's Advent Children attire etc etc). Even Sephiroth has already been referenced in a way in both Nael van Darnus was essentially a Sephiroth clone in fancy armour and a magitek lance, and more recently Emet-Selch, both having a 'walking into the flames' scene like Sephiroth's famous scene in FFVII.

I mean, stranger things have happened, but the likelihood is practically zilch I'm afraid.