As mobile processors get better (and we might already be at the point where they are good enough), devices are going to be more like computers and less like iPhones. Multitasking and OS functionalities will become more important and the iPhone/Android paradigm of a single, one-function, full-screen app running in the foreground (with everything else on pause or disposable) will be less important. An OS which can spawn independent OS processes and natively handle multicore processing will win out over an OS which puts everything in the same VM and heavily abstracts the OS from the programmer.

To grow beyond a small screen, single-processor, one-task-at-a-time model, the Dalvik/VM system has a load of changes to make. Linux, and consequently Meego, are already there. Qt and QML are great and--especially if QML ends up running on Android and Windows Mobile in addition to Maemo/Meego and desktop OS's--but the real stuff that is going to make Meego powerful and flexible are DBus, Telepathy, the Linux filesystem and security model, and the years of development on freedesktop.

Don't think just "Angry Birds". Think about having an email/text/im/video communications platform with extensions like Firefox has. Think about Dropbox being integrated into the platform like it is on your desktop instead of a website front-end like it is on iPhone and Android. Don't just think about some remember-the-milk front-end, but think about Cisco writing a VPN client or HP writing printer drivers or Bank of America writing a secure handheld payment system. Basically, a JVM lets you write "apps" that run on lots of phones whereas Meego will let you write both applications and systems that can be deployed to lots of phones.

If I wanted to make more phones like iPhone and Droid, I would probably choose Android. If I wanted to make the next generation of phone that makes iPhone and Droid look like toys, I would use meego.