I think the biggest question now for Bannon is: What's next?

Being forced out (or "resigning" or whatever you choose to call it) means that he's probably lost the support and therefore funding of Robert Mercer, which is a huge problem for him.

He seems to be claiming that he's resigning from Breitbart to continue focusing on politics, but to be forced to make that choice implies that he's no longer in Mercer's good graces, which futher implies that if the Breitbart money is gone, then he's no longer going to be funded by Mercer for political ventures either.

This kind of leaves Bannon rudderless, and homeless.

P.S. I also think it's worth considering whether this all happened because Mercer was given the choice between access to Trump or continued association with Bannon. and even for a guy like Mercer, access to the presidency is a very attractive carrot to put at the end of a stick.