Not only that but Tod has said many times already - when commenting on modding - that their largest potion of their audience is on the consoles. This means the largest portion also won't have access to the DX11 features the PC can have. It's unwise for Bethesda to go and waste money on adding support for something only a small portion will be able to share. Besides, alienating the grand majority of their consumer/fans is just plain ridiculous as otherwise they would feel 'left-out' from all these cool features it would otherwise have.
You (all) have to remember that gaming is a business as much as any other.