Yeah, if you happen to live in a newly-wired building in a major city or suburb. But if you're talking about replacing TV or DVD/Blu-Ray, it's not about what the fastest guys have, it's about the slowest 5-10% have.
Even if you assume "everyone [and that's 1/3 the country] still on dial-up is such a late-adopter they're not even interested in HD yet", a lot of that broadband is less than 1 Mbps. And many broadband consumers have monthly bandwidth caps.
People with >1Mbps uncapped broadband is probably too small of a market to make purely digital distribution viable.