Well that is not 100% correct there are decentralized tokens that are independent of other crypto, but most of them are just inflated due to speculation. Tokens like lympo.io that have real world applications have no fear if the entire crypto space collapses and it has shown that in a bad market and crazy crypto dips, it remained green all the time from it launch. Plus they are doing something that has never been done before by any other ico for that matter. They will be giving away companies stock to tokens HODLers, because it is a real business with a real usage in the world, so no matter the economical climate it will still be used, learn more on https://cryptonews.com/news/lithuanian-startup-kicks-off-new-coin-model-mulls-ipo-1438.htm