I disagree completely, except that he may not know what he's doing as president of the US.  I think his track record as a successful businessman speaks for itself, and if he wasn't a good one he wouldn't be rolling in cash, now would he?  As much as you or anyone else might detest the man, he's certainly not a failure in business or politics. 

I'm not a Trump fan by any means, and his comments about bitcoin are meaningless to me.  Bitcoin is global.  One politician in one country should not be able to influence the price of bitcoin, even if it's Donald Trump who's doing the tweeting.  I'm very surprised people are still listening to his nonsense anyway.

I doubt that.  He has enough money already and probably wouldn't invest in something as volatile as bitcoin.  My guess is that he has the majority of his wealth in safe assets and not in speculative ones.