Probably never because every generation of Starlink satellite has been dimmer than the last. Despite being significantly bigger, the v2 minis are only 19% as bright as the original satellites.
I live in an area where we can just barely still see the milky way, but light pollution is encroaching steadily.
The main problem is all the empty office buildings decided they need to leave their lights on 24/7. (Check out a light pollution map of Silicon Valley to see which megacorps are the worst offenders).
LED lights are probably a bigger problem though. They’re free to run, so people leave them on all night. Global light pollution has been growing exponentially in the last decade (faster than the population).
Yeah white lights can't be filtered out whereas sodium vapor lamps' narrow emission spectrum can be easily blocked by special filters.
Also, many LEDs have reflectors on top that prevent them from shooting light into the sky. These aren't required by building codes from what I've seen. Similarly, I don't think buildings are designed with this in mind.
Office buildings with massive glass atriums / skylights tend to be particularly bad offenders, since indoor lighting is often designed to bounce light off the ceiling.
I'd love to watch a satire where eco-terrorists in cat suits attempt to do what you're suggesting though.