No court is willing to hear it. So it will never be proven. The deep state is a lot deeper than we thought.
There have already been court cases that have ruled in our favor, with more to come. The documentary on YouTube, miraculously, has not been removed yet. It states that 20% of Dem voters concur that there was fraud. The Time magazine article-though cloaked in anti-Trump rhetoric, is an admission paving the way for further revelations.
Hope makes me think the tide is turning. I believe that slowly and surely all will come to light. Americans will choose a disruptive change over a fraudulent administration. They must.
Nullification or quo warranto
The academic question is what if a court heard it, or somehow it otherwise becomes accepted fact the election was decided wrongly.
The constitutional remedies are resignation or impeachment and removal. There are options within that, basically that the DEMs could choose a successor, ala Ford selected by Nixon after Agnew resigned. There is no way the government would allow Trunmp to assume the office again, or any other honest person, for that matter.
I don't think our federal government is capable of doing the right thing no matter what, so I view the question as purely academic.