I really don't think Elon Musk will create a meme coin of course a meme coin doesn't have use at all I think if he is going to create his own cryptocurrency I think he will create something that will have a product or this kind of coin can be useful for its project probably Spacex, Tesla or many more.
I believe you, he will probably have other ulterior move about his own project but the same time, he will still stay with doge because of his investment, that dude isn't just smart, he is wise in making decisions. I just came across a news that he is now assigned as adviser with Buterin on doge coin as team.
A coin created without used can be tokenized if the need be my friend, stop saying a token doesn't have a used case because even the ones making promises on paper are yet to do the physical magic.