I'll add that my main hope is that the scale required for launching large satellite constellations will also make it cheaper to launch space-based telescopes,

I'll add that my main hope is that the scale required for launching large satellite constellations will also make it cheaper to launch space-based telescopes, but it's far from clear that would be a major benefit (after all, launch costs will probably be on the order of 1% of the JWST's total ~$10B cost).