The problem with that logic is that even if Nokia does drop it, it won't matter. There's still the Linux Foundation, Intel, and every other large scale adopter. Even if Nokia never put out another MeeGo product again, everyone else still probably will.
Not to mention that Nokia and Intel threw quite a lot of money on getting people interested in MeeGo. There's threads on that MeeGo conference (or was it Nokia World? IDK), describing just that. So that takes out the Windows 7 point of the initial post.
The Android point just... doesn't make sense? Best hardware? The N900 is a year old or so and it still overperforms so many phones out there. And the N8 certainly shows supperiority to quite a few things. In fact, when was the last time Nokia's latest flagship phone didn't come with better or at least matching hardware vs. the competition? Yeah, Android has better hardware platforms NOW... because MeeGo isn't on any mass-produced devices yet (unless you count the N900s running development builds). They'll no doubt equal out when the mass market MeeGo handhelds hit.
As for the iPhone point - if MeeGo retains the right aspectas of its roots, MeeGo will not only have Qt applications, but it will also hopefully keep being able to run uncompiled Python, Perl, and Ruby, as well as a bunch of other coding languages. The iPhone developers are numerous now, but it's also going to become far more advantageous to develop for MeeGo when it takes off, because your Qt apps can go anywhere MeeGo will be, which will be a lot more places than just phones.
If anything, MeeGo has simple mass adaptation of predecessors (by users more so than developers) and Apple's marketing to fear - not actual objective disadvantages. That's not to say there won't be any, but there's no indicators of specific ones yet.