Now if Johnson is voted out.
By law Congress starts the new session on Jan 3rd, where the Speaker swears in all the new members.
If there is no Speaker , then as some have suggested the Clerk could do the honors.
If this continues to Jan 20th, then the weird stuff begins.
Once Jan 20th comes Biden & Harris and all their appointed secretaries are out and removed from the line of succession.
Normally the next person would be the Speaker of the House followed by the President Pro Tempore of the Senate, who is 91 years old.