I think it´s still underground cause it´s not as reachable for people who are not into techno.
for example, i got some kids in my class and whenever i tell´em i listen to techno they just have no clue what i´m talking about. like mark said, people who aren´t into it think techno is stuff like Scooter, Drunkenmonkey, etc.
when i look back 3 years from now, i was thinking the same
stuff, till i first hit a techno club and got my eyes opened.
another thing might be that allmost everything is only (luckily) released on vinyl....
just my opinion