I don't keep up with coin memes, but I'm pretty sure Elon Musk will stick with his Dogecoin. if he was really interested in Shiba, then he would mention it on his social media, or at important meetings discussing this matter.
Elon Musk already tagged Shib Inu on his twitter account post and he even named it as Floki, then the Floki token appeared very quickly with very high volume in a few days on dextool, at that time all Elon Musk posts became the most awaited headlines by most of the community crypto. I'm sure there is potential for the Shiba Inu to reach the highest price but not sure when that will happen.