I posted this a while ago in a different thread, but I'll say it again here.
A remake actually makes more sense to me at this point. I sort of feel they've taken it as far as they can with simply making more sequels. A remake could be a good chance to put a fresh new spin on things. The rebooted Planet of the Apes series is proof that, sometimes, starting over is the best way to breathe new life into a franchise. I don't normally feel that way with franchises; usually I prefer a traditional sequel that keeps the same storyline going, rather than hitting the reset button. But with Land Before Time, a 15th film would probably just be another lighthearted musical (which I'd still watch anyway). Whereas the idea of a remake is more interesting to me because then I wonder, how would they take the original film and approach it from a different angle?
I'm not worried about them "ruining" the original Land Before Time, in the sense that it simply couldn't happen for me. I love the original film, and regardless of anything else that happens, I can always go back and watch the original again.
I would welcome a second season of the TV series, however.