No, he won't want to buy Bitcointalk, never.
Because bitcointalk is not a fancy platform to build connections and shill your posts to walls, notifications of other users who are in or not in your connection/ friend/ follower list.
It is different than social media platforms like Facebook or Twitter when your notifications will be spammed with many statuses and tweets from others.
Bitcointalk is not a place for Elon Musk to play with his jokes that he always loves to do.
Agreed. Bitcointalk is more of a tavern or a guild where bitcoin enthusiasts and cryptocurrency believers alike come together for the exchange of ideas and opinions on matters that concern the cryptocurrency world. No way Elon's looking at this forum and saying "wow this is a profitable venture, I wanna look at buying it". And even if he does show interest, idk if he could rightfully own a decentralized forum like this.