All of those covers are in niche genres. I've no idea why you think that means the song should be more universally well known. I'm not sure what it is about music but some people find it very hard to relate to people with radically different musical tastes. I'm sure much of it is on purpose, though, to make people seem more cultured and refined.
I disagree that downtempo and drum and bass are niche genres, but in any case I'm not saying "these covers show it should be better known". I'm giving examples of how big a tune it is within my (and friends) musical bubble, didn't mean it as a dig against yours. Sorry if it came across that way.
