Until Elop canceled everything Symbian was still selling - declining sales, but still millions of units. So while the situation was bad slowly phasing out Symbian for taking all the money you could make with that, while hoping N9 software stack sticks sounded like a more sensible approach than "cancel everything, go for Windows". Elop did respond to criticism from Developers (including a mail I've sent him with colleagues), but had made up his mind.
This blog post is a byproduct of that discussion, and was referenced by Felipe in internal mailing lists back then:
https://felipec.wordpress.com/2011/02/22/meego-scales-becaus...
I have no idea how successfull it'd have been in the end - the UI was great, parts of the softwarestack were problematic (though we've been doing quite well with parts of that at Jolla later on). The planned hardware for the future models was less than ideal, though.