What makes you think that such will exists beyond a fringe of extreme libertarians and anarchists? Excluding that fringe and excluding speculators, what you are left with are people who want to avoid the fees associated with electronic payments. Those people are using Bitcoin via intermediaries as a way to send and receive their local fiat currency. In other words, Bitcoin itself is irrelevant; any electronic payment system with lower fees would do, regardless of how it is structured.
There are also a lot of people who live in countries with a high rate of fraud or don't have access to banking services or credit cards. Bitcoin, as an extremely cheap and irreversible payment method, would allow them to participate in e-commerce.
It's true that the average law-abiding middle-class American isn't going to see much benefit from Bitcoin but they're a small subset of the population of the world.
That statement included no specific reason for widespread adoption. I merely said that if people wish to use bitcoin for whatever reason, then I hope that they succeed. Whether they use it for convenience (the many) or for principle (the very few), I care not. Their reasons for using it are irrelevant. What matters in the long run is that consenting adults are allowed to do as they wish without interference from meddlesome third parties. That is all.