"Better than them" is just barely in the realm where it's not incredible to discuss, and still quite debatable.

Cheaper than them? That's dramatically unproven and unlikely just on power efficiency alone, even if we accept the suspect assumption the only efficiency anyone should care about is currency marked per line of code or theorem proved.

We're not just going to have to become better existential philosophers, we're going to have to become better examiners of assumptions and claims.