1) They have dealt with high transaction fees now

2) Crypto will gain use cases as the scene develops, e.g. The Plutus project is developing a crypto payments platform that will let you spend in bitcoin at over 40 million stores worldwide by utilizing the existing VISA infrastructure. Developments such as this, a crypto debit card, would make crypto useable like any other fiat currency but with the added benefits crypto has to offer. Plutus have a live beta app out now that lets you buy and sell crypto at zero fees and are implementing the payment functionality next month. I think this will be a big step for crypto, they've got a bit more info on their Plutus Telegram

3) High price is related to its scarcity