Actually, (as much as I dislike Republicans) the Tea Party and Occupy movements have been forcing Republicans to follow a more constitutional platform.
This is extremely subjective. On one hand the TP has called for a more limited fed government economically and environmentally. It is still debatable whether that's even a good thing! However, I still see the TP wanting to mess with social issues and calling for even greater government intervention. And they still are addicted to their old folks entitlements. As for foreign affairs? The TP is calling for even greater American influence and intervention in the world. Not only was this left undefined in the Constitution and thus (by default) unconstitutional, but also goes against the warnings of some of the greatest leaders we had at the time the Constitution was written.
Where were their concerns over 8 years? They were silent under Bush and then suddenly became vocal once Obama was elected. This raises concerns over their true intentions and motives.
Your my-way-or-the-highway point doesn't really have any merit when they're just following the constitution, when Democrats completely supersede the document.
So quickly we forget the party which gave us the Patriot Act, NCLB, and 2 wars against 2 countries which didn't attack us. I have a hard time that the Republicans have "purged" all their addiction to big government and immoral wars in just 4 years.
Lastly, who says that going "back" to follow the Constitution would be a good thing? I'm not saying we should or shouldn't. IMO, I think in some cases we definitely need to cut government and "return" to the Constitution (NCLB, foreign affairs, Pat Act, PBS funding, etc). On other issues, we need MORE government intervention (Regulate WS, break up the big banks, health care).
But if the past 200+ years have proven anything, the Constitution was written for those who lived hundreds of years ago. It was adapted to their needs and issues. They intended for it to be adjusted and changed to meet the needs of the future generations. Many most likely foresaw a day where slavery would be abolished. Unfortunately, at that time, they couldn't... Not without half the colonies freaking out. It was intended to be a living and breathing document which helped this country not hindered it. If we couldn't change or adjust the Constitution, African Americans would still be slaves, the Air Force would be illegal (or divided up to states to control), and women wouldn't be able to vote.