I've been holding off replying here because I'm not all hot and bothered by the bands mentioned. I've tried the Volta, it's fun in spots, but it's overblown in places.
Yorksvc burned me the Oceansize....it's excellent, but a bit mellow (read slow to develop) for me.
There's plenty of bands in the past 20 years that I consider great. They all don't appear at once. Trying to lump everything in a revival category, well, I don't see it. This music is alive and well in its own niche without any help.
Save the revivals for the preachers
I always cringe when I hear anyone compared to Steve Howe. Steve was great with Yes, and when I've seen him solo and with Yes, but the GTR and Asia is music to yawn by. I like bands working as a cohesive unit (Djam Karet, etc). telling me Johnny Nosepicker sounds like Steve Howe tells me...well I'm not sure.