It's not exactly breaking news that the Republican Party is divided into at least three factions, a condition that has worsen since Reagan left office.  The portion of the GOP that Bannon purports to speak for is shrinking every year, as percentage of the population.  He can support a slate of primary challengers if he wants to, but the reality is that there will never be enough of them elected to be anything but a pain in the a$$.  The net effect of his strategy is to make a dysfunctional political party worse and those who support him even more angry.