as far as i can remember BTC price declines really began once payment processors started dumpin btc to fiat daily for merchants that would normally have held them for longer.  check the date when Bitpay opened for business...This to me was the first of many BTC fiat leaks which led to selling pressure.
ETH is not for buying items from shops/restaurants but can be used as a currency if the businesses wants too or they could create their own Dapp & loyalty token. I hope they never use ETH as mainstream currency as this will only encourage more ETH payment processors for merchants to turn up.
Ethereum’s creators themselves don’t refer to it as a “cryptocurrency.” Ethereum is a shared computing platform, and its base unit is ether, the “cryptofuel” that powers the network: “a token whose purpose is to pay for computation, and is not intended to be used as or considered a currency, asset, share or anything else.”

also you may ask who will pay for this token computation...well in under 3months there is samsung,microsoft,unbuntu rwe,40+ banks and many more..