Altcoins are good but there are so many many altcoins scam nowadays, only legit will remain, everyday, there is upcoming ICO. We can't really avoid that, everyone can do fake ICO, we should only be educated to keep away to many many scams. We should be careful in investing in some ICO.
i don't think this will happen in mean time. Yeah altcoin are very low right now but soon they will rise. it will survive and will reach the highest price again. there are too many altcoins right now and maybe half of the altcoin will get disappear because of lack of the support from the dev, the team, and the community. but for the crypto, I don't think that it will get die too because as long as bitcoin still exist, then the crypto market will still survive and people could still buy and sell the various coin to take a profit