[headcanon]

Today, yes, more people accept BTC for real-world goods than ETH. I, and most ETH holders, are betting that tomorrow that may not be the case. The strength of a cryptocurrency is the strength of it's platform, and Ethereum is basically Google to Bitcoins Yahoo, or Facebook to Myspace, take your pick.

The reason? It's an applications platform, not just a currency. It brings fundamental innovations in decentralized computing that means it can reach places Bitcoin never could. And when that happens, the utility (and price :) of ETH will match.