I think this is very well possible. I listened to the whole lecture of Asghar Mostafa and he is quite successful in starting companies, growing them, launching good product then selling them. He is not going to dwell on EE or PE and grow this company slowly. But really upsetting is their presumably "working on Slate" - dual screen side by side is great concept, there are nothing like this on the market, and I think many people here use both screens at the simultaneously all the time, flipping device back and force just doesn't cut it for me...
MS just bought Skype for some 9 Billions... I tried to use OneNote, it is good, but since for 2+ years my work computer do not have it, I am using Evernote everywhere and pretty happy with it on PE so far... I like Ermine very much (this is my first encounter with Android, but for mobile devices I think it is better than Win Mobile (up to 6.5, didn't play with 7).