As much as I would probably enjoy it, there's no way it would happen. The lore in 1.0 just doesn't mesh with the job and quest lore in ARR. SE would have to spend resources dedicating part of the staff to developing the 1.0 lore which would take away from ARR's development. Also, the original game ran on a completely different server structure that simply doesn't exist anymore at SE.

That aside, I would be a little surprised if they saved anything from 1.0 aside from the models.