Only possible upside is Bannon can now do more damage to the Left from the outside.
That a helluva upside. He might be able to to more to advance Trump's agenda from the outside, too.
Well yes, but equally likely is that Bannon will turn Breitbart loose fully on Trump. Trump could find himself without any allies as the wolves close in both the Democrats and many Republicans.
I was waiting for someone to post your analysis. His leaving is about like the scene from Star Wars where O B Wan makes his prophetic declaration before Vader struck him down. Breitbart is far more popular than it was before he left on leave to do the job with Trump. He also stated he did not expect to be there for more than 8 months.
Now he can get back to the helm and do what he does best.
Bannon can do far more damage to the Democrats/Rinos from outside the WH...
The mediots, rioting liberals and liberal mayors, who allow the rioting are in for some fun times from Bannon.
There will be zero mercy on the mediots and Never Trumpsters in Congress and Rino's in Bannon land.
Bannon has now entered a Free Fire Zone and will take Zero Prisoners!