Earlier quoted context omitted.
This has a "Bitcoin will solve finance" feel to it. Not to be super dismissive, but there's just as much likelihood it will help as it won't. But in your corner: It's true that right now space-based deployment of broadband will provide broadband in locations where it's not currently available - perhaps spurring competition. It's also probably true that space-based broadband will be able to compete directly with urban…
TV made radio irrelevant, the internet made TV irrelevant. Both still exists but as money-losing mass manipulation tools
There's no phone company that made all other phone companies irrelevant.
There's no tv channel that made all other tv channels irrelevant.
And there's no radio station that .. you get it.
And so it's hard for me to concolude that there's some ISP that will make all other ISPs irrelevant. Honestly most people will probably have about a 50/50 split between home wifi and phone internet. And that home wifi might have significant intrusion from space-based ISP, but not completely. (I realize spacex is also hoping to provide some phone service from satellites, but I digress)