Starlink has accumulated roughly 4 million U.S. subscribers, yet the satellite broadband service has so far failed to dent the customer bases of Charter and Comcast, New Street Research analysts wrote Tuesday.

"We haven't seen much evidence of this so far, but it doesn't mean it's never coming," NSR analysts David Barden, Vikash Harlalka and Ryan Smyth said in a note built on a data-sharing arrangement with Recon Analytics.

The 4 million U.S. customer count positions Starlink as a sizable fixed broadband provider, though still small relative to the residential base held by Charter and Comcast. NSR projects Starlink could reach 12 million U.S. users by 2030, a near-tripling that would test whether cable's incumbent advantage holds.

Where is Starlink's growth actually coming from?

Roughly half of Starlink's new U.S. sign-ups come from small rural providers or from households with no prior broadband connection at all, according to the NSR note. That pattern undercuts the narrative that SpaceX is pulling paying customers directly from the cable industry.

The analysts flagged a second data point that runs the other way: "close to 50% of Starlink's disconnects went to cable." When Starlink subscribers cancel, nearly half return to a cable ISP rather than fiber, fixed wireless or DSL.

That churn flow, if it grows, would matter more for Charter and Comcast than gross subscriber additions. Cable operators have spent recent quarters defending broadband ARPU from price compression, and a steady drip of returning customers would erode that defense.

What does the FCC's 15,000-satellite approval change?

The longer-term competitive picture turns on capacity. SpaceX has received FCC approval for 15,000 additional Starlink mobile satellites, a constellation expansion that would lift per-cell throughput and improve latency for mobility and enterprise customers.

With more satellites in orbit, Starlink could serve denser geographies and offer plans closer to cable speeds at comparable prices. That would narrow the technical and commercial gap that today pushes most Starlink users onto satellite because they have no terrestrial alternative.

NSR did not quantify the competitive risk in dollar terms but pointed to the 12 million-by-2030 forecast as its benchmark case. If Starlink hits that target, cable broadband net adds could compress in rural counties where homes-passed counts have stagnated and overbuilds remain scarce.

How should cable read the churn data?

For now, Charter and Comcast can point to limited competitive pressure from satellite. NSR framed the threat as contingent on SpaceX executing on the expanded constellation and on whether the current 50/50 churn balance shifts toward cable losses.

The analysts did not publish a stock recommendation. They did, however, flag the asymmetric risk that falls on smaller cable and rural telco operators that lack the bundles and mobile offerings of the top two U.S. cable ISPs.

The watch window runs through 2030, the year NSR uses for its 12 million subscriber forecast. Until the new mobile-satellite capacity is operational and Starlink's pricing moves closer to cable parity, the NSR team expects the cable-versus-satellite contest to remain a slow-burn story rather than an immediate share shift.