'Red hot chilli peppers' and 'The Offspring', just a small remark...
Anyway, I agree that RHCP do have the potential to stay well known, even in many years... but legends? I don't know. If I think of legends I think of Elvis, The Stones, The Beatles etc., I don't think RHCP will make it that far. Same goes for The Offspring. They've had a few major hits and they're around for a long time now, but I don't think they have the same impact as The Rolling Stones did. And 'System of a down'? No... At least not over here in Holland. I don't know how they're doing in the UK or US, but over here it's just one of the many bands and nothing really special.
-- Sara