I don't think anybody even said they were going to star a petition or anything. I think Malte is only trying to say that you can't say something is impossible unless you are told otherwise by the source or if you try and then are told otherwise.
I agree that this is very unlikely to happen, mainly because The Land Before Time does not have the interest of people that it did 10 years ago per say. However, it truly would be a treat if the deleted scenes were added in the 25th anniversary edition of the movie. When you think about, something is always added or edited in an anniversary edition of a movie, whether it be remastered picture quality or interviews from the crew.
Of course, younger audiences would probably not find as much meaning to the deleted scenes as we would because they never knew about them. Then again, it doesn't hurt to hope.