Actually, I don't really think Gummi ships will be used by TAV at all. In KH1, it seems most other worlds besides Disney Castle are completely unfamiliar with Gummi blocks, and in the Ansem reports, Ansem describes finding a strange material that he's never seen before (which turned out to be a gummi).
Furthermore, unless things were different in the past, Donald and Goofy say in KH one that they aren't supposed to meddle with other worlds and really, aren't supposed to have contact with them at all. Wasn't it only because of the whole mess in KH1 and 2 that paths were able to be opened for gummi ships to travel between worlds at all? So if Gummi ships were exclusive to Disney Castle, it's doubtful TAV used them, at least to begin with.
That being said, the fact that Ansem (or was it Xehanort? I don't remember which report it was now) had a gummi block and wrote about it means that other worlds did have exposure to at least a few gummis. Whether or not outsiders actually possessed or were able to use gummi ships isn't clear. Either way, I think Corridors of Light or Darkness (probably Darkness for Terra) is a lot more plausible than gummi ships for TAV. Though I also like the idea of riding your Keyblades places...that could be fun gameplay.
