Nothing really I believe, because ETH is so low. Most of the coins are based on ETH, and loosely tied to it.
Therefore everything depends on ETH.

Maybe if a crisis happens. People usually start to lose faith for a short amount of time in traditional stocks, bonds and banking institiutions. This is why Bitcoin was created, and became what it is today.
However the economy goes really well now, and noone seems to care about cryptocurrencies. I feel that crypto is an inferior good in this aspect.

Yet again, hype and usage is a huge factor aswell.