Given that the total market capitalisation of all of the cryptos combined is barely 1/5th of 1 trillion USD at the moment, it's really hard to see the entire crypto market seeing that much growth any time soon.
Tim Draper has been historically extremely bullish on bitcoin, so there is pretty much no surprise that he has come out with this yet again.
I'm not saying that it couldn't happen, given that 15 years is an extremely long time and we have no knowledge of future bull markets that may hit. But it sure does seem like yet another prediction where no actual analysis is put in but instead, an arbitrary figure is made as the supposed target in 15 years in order for him to gain publicity and stay relevant. Obviously his $10k prediction was right, but that doesn't guarantee that he'll be right again.