People calling this FUD and saying it will never happen don't understand the first thing about markets. Have you already forgotten the dot-com bubble?
Pets.com raised $82 million with their IPO, impressive by any standards. They were worth nothing within 9 months.
Webvan stock doubled in a single day back in 1999, earning a peak valuation of $6 billion. Went to zero in 3 years. I bet most you have never even heard of it before.
eToys.com stock went from $20 to $76 in a single day when it went public in 1999! 280% in a day! Impressive even by crypto standards. Zero within 2 years.
For every Amazon or eBay, there are hundreds, if not thousands, of similar examples to the ones above. A large number of coins have already gone to zero or are going that way. More coins will follow suit as time goes on, and that is what is supposed to happen. Shit coins, scam coins, productless coins, ICOs aimed only at making money for the creators, coins that don't need blockchain technology but are just trying to cash in - all of these will, and absolutely should, fall to zero.
I think we're in a slightly different type of market, the one that's maturing but also expanding by getting more and more people on-board every day. In traditional markets, the brokerage firms could easily stop offering their customers a specific type of commodity. So can crypto exchanges with coins nowadays, but most of them rarely do so. Look at Bitconnect, the damn thing was knocked down a while ago, but still has some of its market cap and even more surprising, a trading volume. So they will hardly anytime soon go to zero, but probably a lot of them will very soon have marginal significance on the market evaluation.