I think whoever can nationalize the election can "win" it. Therefore, your scenario is not entirely far-fetched but we should have in mind that gerrymandering has made the Republicans relatively safe in most of their seats in the House and only one third of the Senate comes up so the possibility of a sweep election is mitigated.
Accepting your scenario, the question comes up for the big-money donors (big business-Wall Street-Koch brothers) who would they deal with? In other words, would Boehner be unhorsed in the House? More likely he would resign and pass the baton. If Cantor wants the speakership expect a real donnybrook. Whom would the big-money donors deal with in the Senate? Same question arises, who would be the majority leader? I suspect Mitch McConnell would retain the position because two thirds of the Republicans who are already there would be affected by the election only to the degree that they are intimidated. Again, if it's a sweep election and there are major upsets in the primaries (not even excepting McConnell, of course) there might well be a change in leadership.
One thing is for sure about big business donors: they are not ideologically motivated rather they are strategically motivated, they will cut a deal which lies in their interests. Nor are they especially fastidious, they will deal with anyone in power even if they might prefer a Rino who is well-connected in Georgetown and with the Wall Street Journal editorial page rather than a main street conservative who actually believes in God.
A clever Tea Party conservative running either The House or the Senate can find ways to extract money for the 2016 election from these donors when he makes plain the pain he is sparing them, not from conservatives or even from Rinos, but from progressives.
Clearly, the media will shade to the left, that is it will prefer a progressive over a blue dog Democrat, a Democrat over a Republican, a Rino over a conservative and a libertarian opportunistically. Look at the treatment they have given Ted Cruz but also look at the way, Ted Cruz has handled the treatment. He has not put a foot down wrong as far as I can tell either in making his case against Obamacare or in defending himself against the establishment wing in the Senate or against the media. That is a remarkable accomplishment by someone who is embattled but not broken and shows us what can be done when you have an able even a charismatic figure making the case.
To sum up, I think we need to nationalize the election, we need to do it behind a charismatic figure, we must unite against the Rinos first, (not against the Democrats first as is now being suggested) then against the media and the Democrats. We have to let the consequences abide the effort and not shrink from flat-out opposition to the establishment in the Republican Party. If we succeed in that the money will flow, we have to believe the votes will come (or our philosophy is worthless), and the media will be held at bay at least for a time.
