Why Fitzpatrick is playing, Fitz might have had a very unimpressive (but fun) career, but he's playing very well right now, considering the circumstances. I'd say overall he's having his best season ever. Have you noticed he's not going through his usual ups and downs? He's been very steady and consistent, and he's clearly better than a green rookie.
Will we pick a QB in the draft, it's extremely hard to imagine they won't, no matter how they feel about Rosen. There'll be huge pressure to. And unfortunately, the pressure is then to play THAT guy, even if Rosen winds up being the better player (likely for another team). It's the politics of the game. Media and fan pressure count. I hope I'm wrong, but if we choose a QB #1 we'll probably trade Rose later that day, like the Cardinals did. In today's game, there seems to be no room for two highly touted QBs in the same team, for whatever reason.