Being a "constitutional expert" doesn't make the guy a political expert. Paul Ryan would never ever ever ever willingly give up the Presidency so he could make Hillary Clinton president. Ever. Even as a far-fetched thought experiment, this is so far outside the realm of possibility I can safely say it will never happen.
After all, it is possible that the United States government will completely collapse within the next year or two (either because of a North Korean nuclear strike, or just because President Trump runs it into the ground), and then Hillary Clinton leads a rag-tag group of patriots to rebuild the country and then a grateful country makes her president by acclamation.
Yeah, that is totally far-fetched and I don't think anyone would believe that will actually happen. But it is still more likely than Lessig's scenario.
(via Memeorandum)