Coinbase is just riding the momentum train from the recent bullish run in Bitcoin and crypto currencies. However, given their limitations in assets offered, their delays in implementing key technology (i.e. BTC forks and SegWit), and their issues with PR for customer support and duplicate transaction fees they have a ways to go to improve. With the number of competitors they will soon have and decentralized exchanges gaining momentum, there is not way there are the next Google. Don’t get me wrong, their potential IPO will be worth billions but it will not be another Google, Amazon or Facebook in the publicly traded market.