Space hype is nothing new. Werner von Braun was doing it. It is very likely that astronauts could go to Mars, walk around, maybe even stay in some kind of shelt

Space hype is nothing new. Werner von Braun was doing it. It is very likely that astronauts could go to Mars, walk around, maybe even stay in some kind of shelter for weeks to months, and we'll benefit in the form of some technology and engineering spinoffs. But it will be as if Earth's colonizers landed on a barren rock and tried to build a "colony" there. Without people and resources, it isn't a colony. That's not how colonies work. It wouldn't make humaniity multiplanetary. It would just create the longest, most expensive, Earth-based supply chain evar. If Earth suffered a civilizational collapse, the Martians would be dead a few months later.