Such a thing would never happen in Land Before Time. As I said, the world is already established. There's no magic, no worm holes, etc.
If you like the idea, that's fine. I kind of do, too, though not as much as before. If you want, you can make a fanfic out of it. But odds of a movie like that being made are very low, I hate to say.
I'm not saying it's a bad idea to have humans in LBT, but in terms of being canon to the movies, it just wouldn't work out.
Nice pictures, btw.