This will probably happen. If there’s one thing we know about today’s Hollywood it’s that a sequel will be made no matter how long it’s been shelved (Rocky Balboa) how bad of an idea it seems (Rambo 5) or how unnecessary (Indiana Jones 4, Wall Street 2, et al). So this is something that can very well happen.
It would be exciting to see a great Beetlejuice follow-up, but there’s always a problem. I don’t think it’s the danger of “ruining the original” as is often said. If you hate the sequel you can ignore it and still bask in the glory of the original Beetlejuice on DVD forever (and make no mistake, I intend to bask).
I don’t think seeing your favorite characters in a bad sequel ruins the original, I think it’s worse. The original remains intact, but seeing the horrible sequel is akin to witnessing your grandma having sex. It’s just not the way you’re intended to see grandma and you don’t feel right about it. It’s like you’ve been taken advantage of. The thing you thought was pure can no longer be that way in your mind. And that’s the weight that rides on the shoulders of the filmmakers with this sequel.
Please don’t fuck my grandma.