I don't think a Bioware/Behesda game would necessarily be good idea. They make games that are almost polar opposite of each other in gameplay. besides that, I would say that Bioware writing is hit and miss at best. They just keep on slapping on more retcons and plot holes each to each new game. Their dialogue can be good,but everything else is only above average at best, and for the most part (barring Jade Empire, which has its own problems)the 'original' settings that they have come up with far (Mass Effect, Dragon Age) have been painfully generic. I honestly think that a game made by the two would be very, very bad.