I don't see Biden doing anything that inflammatory to the intelligence agencies or any arm of government for that matter (he just doesn't pick those kinds of public fights, that's not his style, whereas Trump seems to be very willing to try and screw anyone who he perceives has wronged him) and I don't see Trump doing anything that hard line republicans might disagree with so long as there's an election in the future so it's likely December or never.

Edit: And I'd be very willing to debate why I think this with any of the apparently many people who think this is so wrong.