Doubtful that they'll add them in-game again, considering their monetary value. It would piss people who paid 20,000,000 gil per to have the trees. Square is cautious to even make a single change to the glamour system (they said that people still make 2,000 or so gil off of each individual 1-5 ranks and don't want to ruin that for them), so something so expensive would be almost out of the question.

That said, a bind-on-acquire version of such via the Mog Station may be viable. Perhaps even a raid drop in the future to provide a small influx to the market board. Both seem plausible to me.