Blackberry 10 is really good OS and Blackberry itself has faithful and amazing user base. I wouldn't be exited by .NET developers either. From 7 platforms I have developed for only J2ME is worse experience than WP (sorry:)). While I can see how illusion that WP is winning is created when it is fed from MS cash cows and BlackBerry is basically underdog now.

In any case I would like to see more diversity not less. Diversity is not harming automobile industry - shouldn't harm mobile industry either.