If you have serious money to transfer into BTC, this is not the way to go. Coinbase essentially is an intermediary, not a wallet. The whole point of Bitcoin is to get of intermediaries as are inefficient and make profits along the way. Bitcoin will solve this, it will just a take a couple of years. Btw, online-wallets neglect the working of the algorithm at some point. The system depends at the moment depends that people know what they are doing.