A lot of them indeed will crash to zero. Even lot's of projects in top 100 didn't do anything major yet but are very overpriced. I'm happy that this huge dump came finally, it's a great opportuity to take good positions.
China did not ban cryptocurrencies at all. They are one of the biggest players in the whole market. Chinese goverment supports chinese projects like NEO, VeChain and other. The only thing they banned were ICO's as far as I remember.
Market situation is very good if you look at the bigger picture. We needed this dump to finaly take some great positions with coins we admire. It's not healthy when everything is overvalued.
If this bitcoin ETF which everyone is talking it will rocket BTC to the 30-50k levels it is possible to reach much higher but in second view there can happen nothing and we will have bear market to 2020 BTC halving