According to Orly Taitz, Biden would not become President. Instead, there would be a special election.
You wrote-
“I, Joseph Robinette Biden, Jr., do solemnly swear....”
Orly Tatiz is wrong. See Article II, Section 1 as well as the 20th and 25th Amendments to the Constitution as well as the Presidential Succession Act of 1947.
A REAL constitutional crisis? Yum!