Cool link!
As Mariner noted, launch costs are coming down.
Reusability does that. Also flight rate.
Which makes new biz plans viable.
But one has been around a long time: the people in the link below proposed their plan to be viable when launch costs got to $100 / lb. This was back in the ‘80s.
https://www.shimz.co.jp/en/topics/dream/content04/