It’s a medium-sized if. So many people said they couldn’t land the Falcon-9 booster.

Ignoring the mars stuff, the vision isn’t that crazy, given their track record.

Biggest questions in my mind are: how rapidly reusable will it actually be (e.g. refurbishment costs), how expensive will it be to scale up the ground systems and launch infrastructure, and what the induced demand will actually look like.

I’m taking for granted that they will be able to land the Super Heavy booster. It doesn’t seem that much of a leap from what they have done before.

I agree with you about the technical aspects; what I'm being skeptical about here is the promised radical (100x+) reduction in cost, multiple launches a day, the usual Muskiana.