Would cheaper/larger launch vehicles significantly change the economics of deploying space based observatories? The James Webb space telescope has cost about $10 billion, and you can afford even today's largest/most expensive launch vehicle (Delta Heavy) for a relatively small fraction of that ($350M).
Basically, if SpaceX makes it, we'll probably have a Starship-launched lunar observatory quite soon, in the grand scheme of things.
This doesn't help the situation now, although there is so much screaming from the anti-Musk people as well as the pro-Musk people that it's hard to tell what the actual impact of the now-somewhat-albedo-mitigated starlink v.whatever satellites are. All of the coverage is breathless sky-is-falling stuff.
In any case, the situation is temporary. Either SpaceX makes it and we get a far side of Luna observatory and LEO/MEO telescopes besides, or they don't and in a few years Starlink all falls down and burns.