Apple could easily take over the enterprise with the iPhone, but many fundamental changes must be made before they could overtake Blackberry. My list in my previous post is just a small fraction of what they need to do. Locking the device down to just GSM carriers with exclusive contracts prevents full scale adoption.
Some of the things you said in your earlier post are irrelevant to the enterprise market. For example, the fact that the phone has a physical keyboard or not is irrelevant to the enterprise. Tons of the business people that I know of are happy with the virtual keyboard on the iPhone. I actually type much faster on my iPhone than on my Treo 650. I've never had a Blackberry so I can't comment much on that, but I don't think it will make me type much faster than on my old Treo.
Second, doing decent quality video is even more irrelevant to the enterprise market. To me, you're just justifying your complaints on your second posts after you made the complaints.
Finally, locking the device is pain in the ass, but this has been the situation for years in the States and the majority of smartphones are locked. Don't get me wrong, I think that the US carrier's habit of locking phones are horrible and I agree with you on this. However, you somewhat over magnified the fact that iPhone is locked on to AT&T while not mentioning the fact that most smartphones out there are locked as well. In fact, most IT guys in big companies are not that concern about the locking issues, which to me is a bad thing.