Starlink might solve the issue of providing internet to far-flung places, which is great. But I'm skeptical they'll be able to massively undercut all of the telecom providers. Building, launching and maintaining a satellite constellation isn't cheap; it's still a question as to whether the economics will work at all.
If it can offer anything near the speeds advertised without the BS of incumbents, I could see a massive amount of demand.
I figure 5% of consumers « served » by both cable and xDSL can’t get good service, and then they have virtually every rural customer that’s anything more than a low-data user. And I’d expect them to capture that one day with a « light » plan. It’s a massive market.
When you said undercut their competitors I assumed you meant undercutting the price consumers pay so I told you the price they are currently offering. I do not know that their costs are and since SpaceX is a private company I don't think we know how much it is costing them to provide it.