One of RIM's selling points is the fact that their devices are available in pretty much every carrier around the world and that there are a ton of different form factors to make consumers happy no matter what they want.
Take the Style for example, while I would probably never get it, I personally know 3 people that joined BlackBerry bc they ONLY like flip phones and since the iPhone isn't a flip phone they chose to get the Style. I definitely think that can be a double edge sword which can help but also hurt a cellphone manufacturer for the obvious reasons.
I personally think RIM needs to condense their lineup into 4 categories from here on in.
- Basic candy bar (BlackBerry Bold for high-end and BlackBerry Curve for low-end)
- Flip phone (BlackBerry Style)
- Touch screen (BlackBerry Volt)
- Slider (BlackBerry Torch)
Now I'm not a developer, so I don't know how easy or difficult it is for developers to make apps available for different phone screen sizes; etc but it probably could only help to have only 4 form factors that everyone could focus on.
That being said, competition is great for us as consumers cuz it ensures that rival companies keep moving forward, unfortunately for us, RIM hasn't yet really used this motivation to increase our satisfaction and pride(yes, pride) to be a BlackBerry owner like it use to be (think back to when Android didn't exist and the iPhone was first released and they couldn't even send MMS, or take video or get push email).
Hopefully RIM gets that back soon...