Blockchain is here to stay, just like the internet. Similarly, certain cryptos. Maybe it's a conjecture, but how likely it is that these major coins are going to lose all the momentum they have gained and just poof away?
For what concerns me, Btc has already done similar things in the past and it went back where it was heading before and went well beyond all time highs. Granted, only because it happened once it doesn't mean it will happen again, but if you can afford not being emotional about your cryptos investments than don't.
At least this is my view, but i don't treat it as black and white. One can cash out even half and stay put.
No?