Bubble bursts are necessary to knock out the multitude of weak entities in the market. Things will be better later and people will invest when they believe everything is more stable. It's not the end of anything.
Even Bitcoin will survive, but it will not be the dominant player long term. Legitimate platforms will thrive later, just like Ebay and Amazon did after the early-2000's bubble.
This was going to happen no matter what. The gains of late 2017 were too dramatic for it to do anything but what it is doing now - coming down.
Crypto bubbles seem to cycle every 18-24 months. Based on the previous 2, we can expect a take off for another one late 2019, or early 2020; which will be close to next halving in June 2020.
Looks like there's enough time for identifying new winners, and good old leaders.
https://www.yours.org/content/welcome-to-the-bear-market--ea4c16edaedd/