NATO is doubling it's troop numbers in Afghanistan suddenly. Something's up. It's just not being broadcasted.
The economic and political risks the West would face under a regional war scenario that included Iran is more than we are prepared for with our troops already on overextended tours of duty in Afganistan and Iraq, though Israel may try to force our hand in this anyway. This strategy may backfire on them in the long run should it plunge the West into a serious economic depression. The inflamed Arab passions in the region could cause the Saudi Royal family to be toppled, a geo-political nightmare for us should it ever happen.