I think if Elon musk drops his own coin it would not do well as we may think it would, why is that, to me Elon musk is double standard, tweet today in favour of something and against it on another tweet, I think investors may look at this before Investing, and obviously I won't get his coin if any comes out on mainstream, read up about Facebook coin and from my research it didn't do exciting things even with the amount of Facebook users, I think Elon musk coin if it comes out would do worse.
Still am only predicting, some alt-coins I didn't take serious did very well early this year, so crypto-currency prediction aren't concrete.