The future of Ducati is more intriguing than the future of Valentino Rossi. Rossi is hungry to win again, and hungry to score regular podiums. I don't think he is nearly as hungry as 2008 & 2009 so I don't think he will take the risks necessary to win a title over an 18 race season. If he scores a few wins a season and scores regular podiums, he can bask in the limelight of positive media attention without being mauled by the yellow army. He might even take a kind of twisted satisfaction in drawing bigger crowds, though he is not champion. Rossi already indicated this would be the future of his career, when he said he was happy to return to Yamaha as the #2 and have some pressure taken off of him. If Valentino wins another title, it will just happen as a result of close competition. You won't see him put his health on the line to win by over 100 pts, imo.
Ducati's outlook is much more bleak. The Desmo GP has only turned properly for 2 seasons. Once in 2006, when the fuel capacity was reduced to 22L, and Bstone started developing the new 800cc tires. The second season it turned properly was 2007, when Casey won the championship in the new 21L 800cc era. After the emergency tire meetings in 2007, and after the resulting regulations were put in place for 2008, the Ducati stopped handling properly. Ducati are a factory team that cannot build a chassis/engine to cope with the tire regulations or the control tire. They've tried everything, including switching the entire bike to carbon monocoque so they can play around with positioning the ballast. After the experiment with carbon fiber didn't improve the handling or Casey's lack of front end feel, Ducati hired the team that out-developed them on the new 2008-spec Bridgestone. Even the most prolific development duo in MotoGP couldn't make the Desmo turn.
Other than Stoner, no one has ever been able to make the Ducati turn, but Stoner's aggressive experimental riding style was not consistent enough to give Ducati a shot at another world title. Which way is 'up' for Ducati? They can't design a bike around the tires, and the tire regulations will probably never allow the same equipment that led to the cornerspeeds in 2007.