Well Ethereum is not usefull going up so fast. Imagine if you have to buy and sell coffee in usd and eth. If the price shoot up like it has done, you end up overcharging you customers. your customer get pissed off and don't come back so no more eth trades. on the other hand if the price goes down you end up loosing money so you wont accept ethereum . In order for cryptos to be usefull 1% - 2% up or down a month is fine. I think if it comes down to 140 - 160 levels and stays there for a bit you will see more adoption in the real world. I believe cryptos need to come down to early July levels to be usefull.