Even if 2006 is a banner year for rock music, it won't be for rock radio.
A lot more stations will probably abandon the format for these reasons:
(1) Rock stations have probably been hurt more by XM, Siruis, MP-3's and I-Pod's than most other formats.
(2) Rock radio's traditional target audience----young adult males----are now more likely to listen to rap and hip-hop than to rock.
(3) In many markets, there is a fast-growing Hispanic population. Some broadcasters believe that by serving this growing community instead of rock fans, they'd make more money.
Until about a year ago, I thought that my hometown of Boston could support the three contemporary (active, modern or alternative) rock stations it has now: WBCN-104.1, WAAF-107.3 (transmitting near Worcester, but with a good signal in the Boston area), and WFNX-101.7 (weaker than WBCN or WAAF, but with a good signal within about 20 miles of Boston). Now, I'm not so sure. Although I feel Boston will still remain one of the strongest markets for rock radio, I don't know if Boston will have three commercial contempoary rock stations a year from now.
But Boston will be lucky. There may be quite a few markets without any active/modern/alternative rock radio stations by next year at this time.