It might be difficult to say that Richard & Judy Public are in an awareness
of Brian Eno, but he's hardly underground either.
He's interviewed on British TV and Radio quite often, gives lectures, does
music for exhibitions, publishes books etc. I think his involvement with
U2 is pretty well-known, even among U2 fans.
A few years ago Paul Morley did a programme "The Thing Is...An Interview",
which ducked and weaved around the standard interview format, with Mr. Eno
as the subject. OK, it was on Channel 4 so the audience will have been
pretty small but I think it's simply untrue to claim that only "musicians
and music business people" are aware of him.
adam