I think you need to look deeper into "what becomes profitable when the kilo in orbit costs the price of an airplane ticket". Orbital data centers have a different set of serious engineering issues yet to be solved. The cheap launch is a necessary condition but not a sufficient condition. The logistics of orbital manufacturing and maintenance are by order of magnitude more complex than terrestrial. Even cooling of the data centers is not so straightforward because space is a huge isolator, so you will need huge radiators made of expensive materials to make it viable. Then you have radiation in space that makes everything shorter-lived, even electronics. Space mining is ultra complex that will also not be cheaper than Earth mining. So, yes, you will have cheaper payload to orbit cost to raise the initial machines there but you will still have virtually all other imputs more expensive.
As for the space mass tourism, I do not think it will be a thing. One surely wants to go to outer space and see the Earth from a far, look for the God themselves, make sure it is round and so forth, but very few will want to have a vacation in space or a space cruise like in the Fifth Element. The outer space is a hostile environment, loud and uncomfortable. It is empty, restrictive, and there is nothing to do there. 4 months one-way travel to Mars, then you have to wait 18 months to go back. You have to keep people on a cruise ship extremely entertained for a four day-voyage, everyday at the different port, because open sea/space is a beautiful sight... for about 60seconds. After that, it is just dull and intimidating for most of homo sapiens. Also, what to do at Mars for 18 months, on a freezing, ugly planet where you would need to exercise much more so your muscles do not atrophy before coming back to Earth. Going to Mars would have to be a punishment or mandatory reserve of the human species, that everyone would have to do in turns, like a military draft. That also does not secure the survival of the human species because whatever nuclear weapon can destroy Earth, it can destroy Mars too. It only protects us from extinction in the event of a space asteroid. The only thing I can imagine being more fun on Mars is space sports. Basketball, where you can jump 5 meters like in the NBA Jam lol.
The same goes for a 40-minute flight from Paris to Tokyo. How many preparations do you need to do it? Can you just walk into a rocket with your backpack after security check? For conventional flight, you need to be 2 hours prior at the airport, using your personal car or public transportation. For the rocket, getting to the launch site and boarding would probably take as much or even longer than riding a commercial airplane. Even if we ignore that, there will be years and years before any human accepts the risk of riding the rocket to cut half a day of travel, and still would have to pay much more. BTW, we can have business mtgs online, no need to travel urgently that much, really.
Then one big aspect of the analysis is lacking entirely. Once SpaceX proves a Starship-scale reusable rocket is possible, the competition will jump in, too, so the pie will be smaller to share. The history is full of companies arriving first somewhere, then not being able to monetize it because the timing and politics and 100 other factors were not in place yet.
The physics suggests that the future expansion of energy production is in space, some manufacturing, some mining, and some computing. I do not doubt that. But I do not believe it will happen at the pace you are describing. It may break several companies before it becomes mainstream. And some indicators of SpaceX being on the path of self-destruction are there. They are going all in on an unproven technology to pick up the profits from the non-existent market, riding on the AI bubble that is already in uncharted territories regarding valuations against earnings.
Tesla's road was very conservative, and took 20 years riding on the unprecedented public support for a green agenda, and where it arrived is not domination, but saturation, much earlier than enthusiasts suggested. Now there is a huge valuation and stagnant earnings, many major promises broken (2870, FSD, which were supposed to be transformative), only the car, like many other cars, remained, and the price of the stock is still growing. Now SpaceX is making an even riskier bet, go figure.