Thus far, no company has been able to replicate what BB's do so well for the business sector, and it's not like they haven't had the time. When you talk about "melding consumer and business needs", you're forgetting that for any large corporation, the consumer needs don't matter. Most companies don't want their deployed cell phones having cameras, for instance.
I don't necessarily disagree with your very last statement. I'm the perfect example of someone who needs a smart phone to help with running my own business, but since I'm paying for it I also want as many consumer "Goodies" as I can get. I have a BB, and I love it, but if iPhone can up some of the PIM functionality, they're going to get my money without any hesitation (the lack of a ToDo list is criminal, by the way).