The solar focus is about 600 AU away...(if I remember correctly)
Maybe a project for our great grandchildren...
Ground based telescopes have so many advantages- serviceability, upgradeability, accessability... (Keck was not built with Adaptive Optics (AO), Interferometer, or a laser- all those were added after the fact- huge projects that could never be 'added on' to a distant space telescope)
Space telescopes also have huge advantages- no need for AO, larger range of wavelengths, 24 hr observing time...
Both have their place, and both are advancing our knowledge of the universe incredibly.