Maemo5 and the N900 will run QT. QT apps developed for MeeGo will run on the N900 after a recompile. Ergo, more apps will be available for the N900 and from other sources than if Maemo6 was developed for only the N900 and its successors.

As a bonus! MeeGo will be more open than Maemo ever was. If better telephony, contact management, and other core apps are developed for it, these too have a better chance of being back ported to the N900. A much better chance than core apps developed for an exclusive Maemo6 device or any other "in house" successor if that was the path taken by Nokia.