I'm pro-transit (I vote for it whenever it is on the ballot, and take it frequently). I'm also skeptical of Musk at times, especially the promises about "full self driving" in Teslas.

That said, I find the urbanist/transitphile community's response to Musk's tunnel ambitions off-putting. Most of the criticisms I've seen seem to presume that a person who has revolutionized space travel and electric cars can't perform basic math about passenger throughput. Excuse me if I have more faith in Musk than the naysayers.