What a fuckwad. He's "calling" for a big bitcoin correction - based on what, his few months looking at crypto and his mad skilz at crypto speculation?
Guess what dumbass, the fact douchebag billionaires like you are finally talking about bitcoin is why it isn't dumping anytime soon.
It's possible but i don't think that he is looking at it rationally.
As others have stated, he seems to be interested in ICOs and think that altcoins will overtake bitcoin in the long run. In my opinion this can't be farther from the truth, as altcoins are for-profit companies that need to provide good results for their angel investors and their founders.
I'm going to use a slightly older pic but here:
And that's when bitcoin dominance was still above 50%! Now it's only 40% ish. It's either that bitcoin is going to go up, altcoins stabilize/go down or bitcoin and altcoins both go down but altcoins go down especially fast. Either way, Mark is wrong in his prediction.