Is the Republican Party truly in danger? I doubt it. The utter clusterf**k that is the US economy is pinned squarely on Obama now, rightly or wrongly (wrongly), and the GOP had a deathgrip on one of the two houses of Congress and can and have ground Democratic Presidents to a total halt in terms of agenda. None of this will change if Clinton wins in 2016, she will flounder as ineffectually as Obama has now that the GOP has realized that they can just...not pass anything.
Unfortunately true. The nice thing for the Republicans about believing what they believe- that the problem with America today is that the government does too much for most Americans (and not enough for business owners and other rich people)- is that once in office, they don't actually have to propose any new policies or even come up with actual ideas for policies. All they have to do is throw red meat out to their True Believers (like voting to repeal Obamacare every other week, or investigating Benghazi to find out WHAT REALLY HAPPENED, or..) and they'll get voted back in, time and time again. This is a party that, nowadays,
prides itself on its lack of legislative accomplishments. You can't fix an organization when most of their members and leaders believe that the only issue is that they haven't doubled down enough on their current tactics.