And I'll bet Kamala Harris will be the one pushing the wheelchair up the ramp just as fast as she can.....
This probably won't happen before 2023 because if Kamala Harris replaces Joe Biden, the Democratic Party will no longer have the majority in the U.S. Senate.
117th Congress (2021–2023)
Majority Party: Democrats (48 seats)
Minority Party: Republicans (50 seats)
Other Parties: 2 Independents (both caucus with the Democrats)
Total Seats: 100
The Republicans could then block the appointment of a new Vice President and any legislation from the new President.
If Joe Biden is elected but unable to serve a full term, Kamala Harris would become president. Nancy Pelosi, as speaker, wouldn't automatically be VP.
"Whenever there is a vacancy in the office of the Vice President, the President shall nominate a Vice President who shall take office upon confirmation by a majority vote of both Houses of Congress," Section 2 of the amendment explains.
So don't expect Biden to leave office in the near future.