He's not in his right mind. Disney doesn't sell off IP's to anyone as far as I know. They are in the business of acquiring IP's, not selling them. Even if they were willing to sell it, he couldn't afford it from the previous owner and he couldn't afford it from Disney neither. He also wants to renege everything that happened after MI2. That means abolishing all of the characters, stories, and events from MI3, MI4, and Tales of Monkey Island. As he can't afford to buy the IP that Disney isn't willing to sell, thankfully we don't have to really worry about this happening.

I sure wish there was another Monkey Island game - especially now that the same company owns both Pirates of the Caribbean and Monkey Island, meaning everything from Pirates of the Caribbean is fair game without having to mask the source of the influence like when they were owned by two different companies. Sadly, Disney doesn't seem interested in developing new games from any of the adventure game series it bought in the wholesale acquisition of said company, so we'll probably never see any sequels, etc., from any of these IP's. Heck, Disney doesn't even treat its own old original IP's with much respect nor thought, and none of its own game tie-ins are made with much care. It's a sad state, but that's how it is.