Aside from speculation on the internet, if we are following 'house rules' laid out in the constitution, here is what happens next.  On January 6th in a Congressional session Vice President Mike Pence counts the votes.  If he receives votes for Biden and Trump from the same state, the state would likely be cancelled (voided).  If the 7 states were deleted for Biden, neither candidate would have the 270 required, and the solution would be to have the Congress vote for President, but with 1 state holding 1 vote each, which has a Republican majority in both houses.  In this scenario, Congress would re-elect President Trump.

Furthermore, this is not without precedent, something far more extreme happened in 1876:...