Have to disagree there, Martin
If it wasn't for the "Long way round" publicity, I don't think the 1100GS would have sold as well as it did & those it sold to (or, more likley, rented to on PCP deals) were the "wanabees" - not the real hard core round-the-world types, who still seem to prefer the original R80/R100GS as they are lighter, tougher, simpler & so easier to fix (if required) in remote spots. "Long way round" was great as far as it went, but they had a lot of support & still had problems, plus the bikes got rebuilt by BMW part way round.
Early Oilheads seem to be going the way of K100s - I don't see many Bricks about now & neither do I see many older Oilheads on the road. Combination of not great initial build quality, not great reliability (according to ex-BMW Club acquaintances I see occasionally), dodgy electronics & high parts prices will see them disappear pretty quickly IMO.
Thye have certainly been popular & must have made BMW loads of money, but does that make them a true "classic" ? Don't think so.