It's not trivial to get money into the cryptocurrency system as it is even with trusted companies like Coinbase. For it to come closer to ubiquity, it's going to need to be trusted companies to help money enter the market and for it to be used as universally as VISA or Mastercard. Those payment points (Best Buys, Amazon, etc.) and hard currency exchange points (CoinBase, Gemini, etc.) are always going to be subject to regulation by local governments, as they should be.
Trusted points and regulation/taxes doesn't remove the benefits (distributed nature, smart contracts, and visibility) of a cryptocurrency like Ethereum. They are going to grow based on big corporate support and adoption. In fact, it's already happening: http://www.cnbc.com/2017/05/23/bigger-than-bitcoin-enterpris...