Whatever gains you are talking about, I see little evidence of any real change. The ACA continues to be more and more imbedded into our healthcare system; the XL pipeline has yet to be approved; the Benghazi, Fast and Furious, and IRS scandals have yet to yield any convictions; state laws against gay marriage have been overruled in 27 states; sanctions against Cuba and Iran have been eased; the US response to ISIS remains weak and ineffectual (the same holds true for Ukraine); and Obama has his veto pen that will strike down anything that gets thru Congress that Obama dislikes. And on top of that, the GOP approved the budget for the rest of the fiscal year eschewing any use of it to stop Obama's profligate ways or amnesty.
Just as the 2010 election victory did little to stop Obama, I fear the same thing is happening with 2014. Twas a great victory. Obama's approval rating has been rising with Gallup having him at 50%. And the polls show Hillary destroying any GOP candidate.
You are missing the weaknesses. Many are very disillusioned with the ACA. This means it will be easier to break up if Obama continues to weaken. And he will. All the things in your list are the same. Unpopular and they need only a new President and keeping the Congress with GOP majorities. Things would switch very rapidly.
He is transforming this country
Well, so did Carter. But it got transformed back.