Now I wonder what Mike Campbell is going to do. Petty put out a few solo albums, but Campbell never did. I can't see them desecrating Petty's memory by finding another singer for the band, so they can tour perpetually like the Beach Boys. My guess is that Campbell will simply continue as a producer, something he knows how to do. Benmont Tench already shows up on other folks' recordings, and Steve Ferrone is pretty much everywhere too.
But yeah. We owe Tom a big thank you.