There are a lot of terrestrial wireline last mile access technologies that already introduce 15-25ms latency on the last mile segment. Such as ADSL2+ on old POTS copper wiring or a heavily loaded docsis3 cable network. That is just from the home modem to the neighborhood's closest network node.
I think folks in regions of Ohio will provide an interesting test bed as we’re in fringe coverage of 4-5 of the total set of planned ground stations.
(Speaking of ground station, would be interesting if we could talk to starlink over AWS’s ground relay service.)
If starlink hires some people that understand buffer bloat, the physics are already good enough for them to do better than our local oligarchs.
PC gamers will want wired internet. Everyone else could probably do with deal with 80 ms without even noticing, so SpaceX will be very successful as long as it's affordable and reliable.
Even with ground stations they actually will, there's analysis on youtube about that.
If each router can also be a peer (or even a ground station), then it's going really quick to achieve that.