While everything you say is true, it can't be accomplished in time for the next couple of elections. So for people to think they can "teach the GOP a lesson" by staying home and not voting, they are math-impaired, to say the least. Our country is almost completely taken over by an interlocking web of nefarious leftist plans that they have frog-marched through every institution of society since 1948. There is NO TIME LEFT to accomplish secondary goals like influencing the party system by not voting.
We are in a grave, grave crisis in which every vote against the outright evil of the DEMOCRAT/PROGRESSIVE/SOCIALIST POWER STRUCTURE is greatly needed, even if the opponent is insufficiently conservative. The elections of 2014 and 2016 are two battles in which not enough ammunition is better than none.
I urge people to stop buying any American Made movies unless you know they benefit a conservative group or cause. ("God's not Dead" being an example of what I mean.)
Cut your cables, don't watch their broadcasts, stop doing business with companies that promote immoral things. (Apple would seem an obvious example at this point.)
And Vote.