Nope. McCain is out of the picture. He lost. He didn't get the votes. If Obama is ruled ineligible then it'll be Biden and whoever he chooses as his vice-president.
There is a very distinct possibly that we could end up with a McCain / Biden administration. Primarily because Congress is not able to introduce new candidates for President as part of their participation in the resolution of a non-majority election. Biden would be a new candidate for President as the VP slot is handled via a separate vote.
Of course, this is only ONE of many possible outcomes. I can easily see a situation where Biden will be the President as well. That would require that after the electoral process and after Obama is sworn in, SCOTUS rules that he is not eligible to serve as President. This would require Biden to assume command and I believe that we would end up with a Biden / Hillary ticket.
I also believe that the only benefit from this will be an increase in popcorn sales.
I’m not so sure. Biden did not run for President and is therefore not eligible to be President. If Obama is considered to have committed fraud, it would go to McCain, with Biden as the VP. A fraud was perpetrated upon Biden too.