Indeed, perhaps "holding the web back" is a good thing if it means websites will be more accessible overall, to even less common browsers like NetSurf, Dillo, and all the other text-based ones. IMHO the "feature war/race" between the major browser vendors has had an overall negative effect, as if all sites somehow need to turn into ridiculously bloated web apps instead of the simple and far more accessible hyperlinked collection of pages they once were. Keeping the browser choices diverse is a good thing, even if it means they will all display things slightly differently --- just find the lowest-common-denominator and emphasise the content, the stuff that people visiting sites really care about.
There's been some other related discussion on this topic recently: