Could be. My estimation is, once Mueller releases his trumped up charges, there is more likelihood of defections of Republicans to Mueller's side. Some are waiting just for that, surely. When the Congressional (and possibly IG) reports are released, Trump will be at the high point of making his case to the public, and in the best position to make an offense/defense counter play. Hopefully that happens before Mueller arrests some more Trump team members, but it will probably be close. Also we should expect some sort of salacious media scandal to target Trump again soon too.
You’re assuming that A, Mueller will find something of significance against Trump, and B, that the IG report will be a plus for Trump. There is no evidence to support either conclusion; both are opinions only.
Bannon called Trump’s firing of Comey the biggest mistake in modern politics. Bannon is supposedly on our side. Anyone who can’t envision the cataclysmic upheaval the firing of Sessions or Mueller would precipitate is not thinking from the POV of the media, the swamp or the entrenched politicians. It would make Watergate look like a picnic.