I do not think altcoin will crash. Because in fact, Altcoin is the bridge between blockchain technology and users. The development of utilities and efficiency, meeting the high demand and advanced for people from altcoin are operating effectively. I think altcoin will continue to promote its strengths in convenience and improve it in the future.
Altcoins will not crash, sure. They will be used everywhere. In less than 3-5 years, even teenagers and people over 50-60 will easily operate with the cryptocurrencies. I am looking forward to this time.