Is there some stuff that's too inherently uncool to get revived in the usual 20-year time-frame? I mean, prog was primarily a '70s phenomenon but it didn't really get revived until the '00s. Maybe the same will be true of Orb-style ambient house.
Ambient House was kind of a knowing gag to begin with.
Also it could be claimed that ambient dub, along with trip-hop, has enjoyed a massive revival in the shape of certain types of dubstep.
every single thing will get exhumed and revived without exception.