These games (e.g. Monkey 1+2) weren't made by many people, they were made by a handful of people. Like 3 people for dialogues and story, so the impact of a single person is way higher than in AAA games. And as I said the great thing is that other "legends" return as well, like Dave Grossman (design), the voice actor of Guybrush and the musician Michael Land. So, this game appears to be a return of the old guard who made the originals. And let's be honest: As fans of the originals, who else would we want to be working on a new iteration?

Nonetheless, I'm with you insofar as other people (like Tim Schafer) could theoretically also make a great Monkey Island without Ron Gilbert. And also humor > story.