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Yeah, but it's not only quantity of app, it is quality of apps. I'm not a BB user, so I can't attest to it personally, but there was a pretty negative picture of how poor the current BB World app selection is in an article by Matthew Miller. No Pandora, no Instagram, no Spotify, no Google Voice, etc. I assure you, no matter what they want you to think, up in the C-level offices they are not constantly looking at spreadsheets and planning how to lay off the next round of employees. They like to have fun with their toys too, and BlackBerry best acknowledge that, even if they don't do so openly.
Quick point, RIM is no longer RIM; they changed the company name to BlackBerry. As to your point about apps, maybe it will suffer a little, but as long as there is a good selection of the apps that people want, whether exclusive to BB or multi-platform, I doubt apps will be THE deciding factor. However, that isn't to say it won't matter at all. BB10 doesn't have a lot of apps that I would have thought would have been no-brainers. Netflix, CNN, Expensify, for instance, are not to be had.
Battery life and security are going to matter too. One thing that is great is the built in personal/work profile feature that completely segregates data between the two profiles. That will help alleviate a lot of BYOB concerns. You can easily wipe the work portion of that disgruntled former employee's device while leaving all their cat photos intact. Nice feature.