Yes, I am quite confident Mittens will exercise fiscal discipline, and hold Congress's feet to the fire (and is a lot less of a scatter shot thinker than Dubya, who in any event lost interest in fiscal issues when he assumed the mantle of defender of Western Civilization, and casting light into the dark corners of societies gone wrong).
As to divided government, my thought is that it works pretty well in stopping a lot of new problematical spending, but does not work so well when it comes to making tough choices, like those entailed in taming the entitlements beast, that require statutory fixes. What we do know, is that divided government of late has been a bust. Basically nothing of any gravitas or merit has been done - nothing. We have been wasting valuable time, and now have to endure a lot of BS and silly deflective rhetoric about the relatively trivial to boot.
Yeah... I have a feeling you're going to be disappointed, deeply.
