Adding a basic Android application compatibility layer to Symbian and MeeGo may be a solution that keeps everyone happy - Nokia can dip their toe into the Android eco-system without the risk of losing their identity or control of their own platforms.

Only provide enough compatibility to run the majority of the more popular apps but continue down the native Qt route as the primary application platform. Once Qt on Symbian and MeeGo has found it's feet, drop Android app support - classic bait and switch. Or maybe even keep it going if it makes sense, it will be an advantage Android-alone can't easily match.

Apart from Android, none of the other competing operating systems - WebOS, WP7 - have an eco-system worth snot.