While controller support would be a lot more fun, there are limitations on the console.
I'd like you guys to seriously think about how Divinity 2 suffered for XBox support. I remember Swen talking about a lack of RAM making you reduce the amount of NPCs on the maps.
How much development time was lost making the game play on XBox and on the PC?
How much better could that game have been if it was PC only?
In one of the interviews (think a kickstarter one) the one developer discussed making the Elven Lands and that ended up being scrapped due to deadlines and budget restraints. The end of the game ended up being released a year later too, that was kind of awkward in itself.
Also, the development budget for Skyrim was $80 million dollars, about 59.2 million Euro. The Witcher 2 cost about $10.3 million to make or just over 7.5 million Euro.