All of this is an effort to wake up the GOP Senators who are way to deep in their comfort zone.  Their reelections are not a given and I am all for challenging those who won't support Trump.  I will financially support those challengers even if they are out of my State.  
The combination of Bannon's threats of primaries, fund raising pressures and hopefully a new GOP leadership, should convince these comfortable Senators and Representatives to get off their butts and help Trump achieve the agenda for which the people voted.  
Some apparently think they are secure and can continue to be mavericks and anti-productive.
Roy Moore significant defeat of the establishment GOP candidate should be a wake up call.
Bannon is just a part and I applaud him.