I don't think that Dogecoin will grow even higher, let alone become a new BTC, because I think it's very difficult for Memecoin to compete with coins that have very high capitalization and popularity like BTC, and I don't think Dogecoin is worth comparing with BTC because the difference is very far, namely like copper and gold.
if asked possible or not, this could be a possible thing and just a dream.
but in history what musk has done may not have been against the tech world by taking such a huge risk in proving it, and it's between the life and death of musk's career and wealth if he were to do this absolutely insane thing "wanting to replace the top notch crypto"