I guess that depends how "pure" you are in defining the "conservative changes" you want to see.
If Romney can get the EPA (and other agencies) off of business's throat, simplify the tax code, kill Obamacare (if it isn't already dead) and free up our reserves of energy, I'll take it.
I don't know what you want, but we need to change hearts and minds, not laws, if we want to see changes in moral areas.
And lots and lots of education and mind-changing would have to happen before we could even think about things like getting rid of the Federal Reserve or getting rid of the 17th Amendment.
I don't trust him to do any of that.