I agree with your provoking statement. With the experience of the dot.com (I invested 1 dollar which went up to 17 dollars and came back to 1 dollar) I am thinking a lot about what is the right exit strategy? Especially with a BTC dominance scenario in mind that is not so easy and probably for some coins the answer might be never (only spend it when commonly accepted).
But I am convinced we will see a sell off a few times more before we have mass adoption. Just keep everything through that time? Or "dump" it early on?

One thing seems sure to me: What all the crypto investors think their portfolio is worth now only a few of them will be able to actually realize those profits.