I think the reason BB didn't have the same effect is that BB (both software and hardware) is a tool. Useful, yes, but not really integrated into people's lives. Android (thanks to Google's services) seems to meld/morph itself into people's lives much easier and it almost becomes and extension, rather then a tool to pick up and put down.
Thoughts? (Just wrote out a gut reaction. I haven't used BB since 4.5, and my Gnex is my first Android)