I personally hope that it never happens, I do not want to see Elon having the power to change something like that in crypto, he had it so far but I hope that it ends soon enough that we do not face with Elon changing the price whenever he wants. It should not be available for Jack neither, or anyone for that matter, we should only focus on what we can do and not give any power to Elon Musk because it is scary to think he could tweet and drop the price.
I doubt he would manipulate the price and at the same time place orders or go short or anything like that. That would really get him into trouble.
Anyway, he already stated his opinion. The worst I would expect is that he mostly repeats himself. It would be surprising though if that has any significant on the market. We all know by now what his position is. It couldn't get any worse.