Stop believing that Elon Musk is the God of humanity, he is just the same as every businessman he just acts anything for his personal and company benefits with lucrative words and Doge coin hype is one of them.
I don't think Elon will start his own crypto project or atleast in the near future because people will find his intention of just profits so he may create one in the next 5 years later but his influence may last that much longer?
Maybe to cover up his intentions he won't make a new meme project but he is acting on his stage name to create new hype on meme coin, there are many new coins when hype meme coin and almost all of them are related to elon musk by making coins in his name, I think the community has interested in NFT.