Well that's the way the artists make their money directly..by touring. There aren't enough markets out there for all of these acts, you're correct. Maybe a 2 US tour cycle for each album and an international tour for each band? That could work. There are bands out there still supporting the same album they came out with like 4 years ago.
Yeah, I think people just get burned out on the same bands. Like...some bands play my area 5-6 times a year and they downgrade venue sizes as they continue because people just won't come back to see them over and over.