It becomes complete vindication.

It will be hard evidence that there is systemic election fraud committed by the Democrat party and/or it's operatives (I bet it is CIA). Biden will be seen as illegitimate to many people even without other states decertifying. The Democrats will be "the party of liars and cheaters" which completely destroys their credibility with independents and moderate Democrats. Their base will never believe it, so they will die on the sword of still supporting them.

MSM will still try to push the "falsely claimed" and "claimed without evidence" narratives, but a lot of people are going to scratch their heads and think "Who's gaslighting me right now?" They will go down along with the Democrat party.

It will pave the way and essentially quash any resistance to forensic audits of other states. No one will be able to say that forensic audits aren't justified because there's no evidence of widespread fraud; just no one is going to buy it. That argument will effectively be neutered (but they will still try). I think this will ultimately shed light on the sheer scale of Democrat election fraud all over the country, in places no one would ever think it exists, that will drain all political clout out of the Democrat party.

... At least, that's what I hope happens.