I think they would still fail with MeeGo, same like Blackberry failed even though they had really good OS. I remember was going to their conference in amsterdam and were giving their new Blackberry Tablet for free to attract developers to make any app.
If Nokia and Blackberry team up they maybe would succeed. Nokia Mobile still could be around if instead choosing Windows Phone would release Android phone back then.
MeeGo was actually just a branding of failed project with Intel's Moblin. What nokia shipped was just "compatible with Meego". One key differences was that MeeGo spec was based on rpm packaging while Nokia used deb's. I dont think this played well either in adoption of new "burning platform" :)
BlackBerry didn't have a really good OS until 2011 or later which was too late.
The blackberry tablet was amazing at the time, especially if you had a blackberry phone as well. The issue was App development was a pain in a rear if i remember correctly, where it felt like you had to reinvent the wheel for everything you needed to do.