All these articles look at the market share of "new" smartphone. Not the actual market share.
For example there could be close to 1bn (made up figure) Nokia smartphone users at the moment. even is nokia sell none and Android and Apple shift 100m units a year, that would still take close to 10 years before they been Nokia's market share.
I know that's not really what we're discussing, but it's worth baring in mind.
Yeah very true, the number of people who already have Symbian handsets is massive. That was another bonus for Meego: the Qt development environment meant you could write an app for it and it would work seamlessly with Symbian as well. That's A LOT of potential customers!
And remember, Meego wasn't just for phones, there's lots of companies (including Intel, who are pushing it very hard - it's their only bet to get x86 CPUs onto phones and tablets!) who are working on releasing netbooks and tablets running Meego as well, so if you made a simple mobile phone game for the N9, all you need to do is stick it on Intel's AppUp store and it'll make its way to millions of bigger machines as well!
And as if that weren't enough, Qt apps will also run on Windows, MacOS and full Linux, and they've just announced official support for QNX as well (so they'll also run on Playbooks and future RIM phones). And, of course, on Maemo, for those poor neglected N900 users!

There's also unofficlal projects trying to get it to run on iOS and WebOS! Hell, I read it'll even run on WM5/6! (no idea how well though)
It just goes to show how self-contradictory and disingenuous Elop was. If this was a war of "ecosystems" as you called it, why jump onto a platform with only a handful of estalished users, instead of sticking with Qt and tapping into an already established market of tens of millions of Symbian users as well as hundreds of millions of users of other OS including the most popular desktop ones!! If you're a developer, would you rather write for WP7, or, with a single stroke, release your app for Meego, Symbian, QNX, and, through AppUp, Windows, Mac, and Meego laptops and tablets?
And even if I'm wrong on Qt and it wouldn't be as easy as that, there's still good reasons to stick with Meego in the form of Alien Dalvik, which will let Meego phones run any Android app like magic! Works on the Playbook already. Why not launch a phone with a pre-existing application library of millions of apps instead of having to beg, cajole and bribe devs to write for WP7?
I'm not dissing WP7 here, I actually kind of like it, I'm just questioning Elop's reasons for going with WP7 when he was already sitting on the slickest, smoothest, most powerful mobile OS today in the form of Meego, and, through QT, could have plugged it into an established ecosystem of millions of apps and tens of millions of Symbian and other existing users!
I've read the Iliad, and I know how this story ends.
EDIT: on Dalvik:
http://www.slashgear.com/nokia-n9-android-app-support-promised-with-alien-dalvik-22160809/