To be fair, none of those are ultimately a matter of "can't" so much as "don't really want to." When we got a billionaire who wanted serious space colonization,

To be fair, none of those are ultimately a matter of "can't" so much as "don't really want to." When we got a billionaire who wanted serious space colonization, we got SpaceX, which is currently working on a moon lander that qualifies as a base in its own right. And of course, we had supersonic jets, there just wasn't enough demand. People want cheap flights more than super-fast flights. We often get excited about these things, but society usually doesn't. That may be one way in which the current AI boom is different.