My predictions:
If BoB keeps advancing and doesn't get bored, the "fairweather" NC corps will jump ship, reducing the NC's numbers by a huge chunk. The NC has absorbed so many corps and pilots from failed alliances it's not even funny, and alot of them won't stick around for a real fight. We'll probably see the ex-ASCN half of IRON run off first.
How quickly this goes for BoB really depends on if or when MM decides to fully back their allies. If they wait until RZR starts losing space, it will be too late. The NAPblob is being picked apart one by one, and none of those alliances alone can match up with BoB at all.
It seems the NC's motto of "attack one of us, attack all of us" only holds true when they know they can win. We saw it with MC, and now with BoB. Unless the master plan is to wait until they hit MM space, with their hundreds of POSes, it doesn't look like they will be able to stop BoB.
The best part is that with RA gone, and the NC being picked apart, Goons are running out of allies to save their asses. It will be entertaining to watch their space be picked apart by BoB when the time comes.