We will see. It's only anecdotal, but I have quite a few friends and family members who have grudgingly switched from BB to Androids and iPhones, and even after a year or more they still hate the on-screen keyboard. I used to tell them to give it time, that they would adapt, but it has not happened and doesn't seem as though it will. If the BB10 with a physical keyboard is any good, these people won't hesitate to switch back.
I guess the question is, how many people out there feel the same way?