Should Ian Malcolm/Alan Grant make an appearance in Jurassic World Sequel?

I think Dr. Malcom should have a cameo where he talks about the park going wrong and Chaos Theory or something like that.

I do not know, after all Trevorrow said he wouldn't want to be bring back the original cast since it might make audiences freel a bit older seeing how old all the other actors are.

But I would find it interesting if they did make a cameo for Ian Malcolm and/or Alan Grant.

Sam Neil should. Jeff Goldblum made his in one scene with Lowery's desk. Big picture of Ian Malcom on his own book.

If they take the story off the island, I think it would be a good opportunity to give them supporting roles or cameos. At that point they wouldn't be going back to the island. The island would be coming to them. So it's less of a logistic story problem of, "How do we get characters who don't want to go back to come back?"