Well....had he not had his whole "Rin-spasm" as well as constantly trying to tell people to give up when CLEARLY they are not giving up....I would have been upset.
Since he did do those things...I thought it was interesting to see him lose...I like the Juubi, Madara, or Orochimaru as the final villain.
It would have been fitting. Of the villains...he's the only one who seems to have a noble cause despite his evil actions. To see him fall to pure evil because he was not evil himself...would have been somewhat fitting.
Still...with the potential this new development could bring...I think it could be cool so I'm not too depressed.