As long as they implement additional FF9 content like they did with the Weapons and the FF8 references in Eden, I'd be all for it.
If they just add an Omega-ish storyline to justify FF9 cameos....I'd rather not have it to be honest...
Also, they said that new content is coming to the Gold Saucer soon. A lot of us are still expecting Blitzball, but I am actually down for Tetra Master, even though I always preferred Triple triad! They could have the cards work in both games (just need each cards to have two sets of values, of course), and they could eventually make the 4 star cards useful for TM if they don't want us to use them in TT...
Honestly though, the thing I want the most from FF9 : the jump rope challenge! (that's a joke, this would be atrocious)