I doubt QT will make everything fine, but it does give a path. For example QT across Windows, OSX, and Linux does a few glitches and bugs. But the capability to run Amarok in say both Windows and Linux is wonderful.

Likewise I predict a whole lot of initial problems since Meego will be running on so many variants of hardware. But eventually being able to run the same app across different architectures would be wonderful.

The whole Meego thing has been interesting. From one point of view, it gives Maemo and Moblin legs to stand on, as Android increasingly becomes a competitor (one of the many reasons of its success is the many angles of attack Android has). Don't like the Droid? Fine get the Nexus One. Don't like that? Ok get another device, but they all run Android. Meego, has the potential to do the same thing.

On the other hand it adds a slew of problems that now have to be addressed lest each Meego distro runs apps designed only for that system. QT cross-compatibility is the proposed solution for that problem. So while it won't solve everything, it provides a path.

Otherwise everything will be run through a java bytecode interpreter. =P