Oh, how you have fallen. You were the tablet that was going to challenge the 90%+ market share of the iPad. You were going to link from an existing Blackberry to create a secure, bigger kind of Blackberry. You were going to be the promise of accessing a bazillion applications from two different App Stores all running on your sleek, thin easy-to-multitask package. You the promise of so much, Playbook, what happened to you?