Yes I'll put money on them just getting new VA's for them who will probably sound nothing like their previous ones at all. Like half the characters that came back in the TV show.
But still would be better then killing them off.
I'd hate to see Littlefoot lose another family member...
And as much as I despise Topsy and think he's a swine!
I wouldn't want him dead, as he's Cera's only on biological parent in the sequels, and if he died it would make Cera an orphan, and leave her heart broken along with Tricia and Tria... If their in the 14th film that is..