Definitely agree about the Bill Gates point you made but that's is a completely different extreme then, "Wouldn't it be cool if they demolished Harry Potter and put a Twlight themed area."
A few years back there was a rumor that Uni was going to erect a tent over Islands of Adventure for Halloween Horror Nights. That's a stupid idea.
Also having Penn & Teller at HHN was a stupid idea from conception.
So yes. There are stupid ideas.