The current bit of pseudo-coup is still about kayfabe and scripting. The first WH staff resignation by Stephanie Grisham has just happened because of this violence.
Trump’s resignation could happen simply because this latest attack on Congress facilitates the award of Pence’s pardon of Trump, not due to weaseling but for something, something reasons(sic), prior to the inaugural.
There won’t be a 25th Amendment invoked because there aren’t the cabinet votes. This is more about a Nixonian exit because he cared about the presidency. Trump can frame this for his base as a principled(sic) resignation with more grievances on which to base future grifting.