I think the developments are normal and beneficial for the sport. There are rumors circulating that Aprilia are withdrawing as a factory team as well. Yamaha and Suzuki are already gone.
WSBK has five year contracts like MotoGP, 2003-2007 was the first contract, after which time the rules for twins were changed to 1200cc with air restrictors and performance indexing via minimum weight. The second contract is 2008-2012. The rules/homologations will almost certainly change for next year. We already know Ducati are withholding the 1199 Panigale until the 2013 rules are in effect. I don't think we will ever know the extent of the changes b/c the public rulebook is only a fraction of the actual rules; however, factory teams will probably not be necessary from 2013.
Yamaha withdrew their factory effort (via Yamaha Italia) for this season. Suzuki canceled the contract with Alstare and they are exploring a privateer arrangement with Crescent and Yoshimura.
Imo, we have the current ridiculous WSBK rules b/c of Ducati and the AMA. Until recently, the AMA was thorn in WSBKs side b/c they had a huge moto market with tons of funding, talent, and mechanical personnel. Those days are over, and DMG is much more amenable to international cooperation. Ducati were never terribly keen on showcasing their tech in the Japanese-dominated AMA so they wanted an international series that gave them more bargaining leverage.
Long and short, the changes will be about finances and accessibility, imo. The manufacturers are tired of dumping tens of millions into WSBK; instead, they should be earning tens of millions by selling race equipment to private teams (funded by sponsors). If Ducati sells 500 Panigale R's per year, at $50,000 a pop, to professional privateers and club-day amateurs around the world, Corse would generate over $25,000,000 in revenues (including service contracts, etc). That's where WSBK is headed. Financial sustainability. Whether or not they will reach financial sustainability in a cutthroat industry remains to be seen.