Radio scintillation of the Interstellar Medium becomes an issue, I daresay the radio equivalent of "active optics" could help.
I did mention this at an outreach talk with Astroblack morphologies[0] and Tim O'Brien[1] who pointed out that ISM scintillation was on his slides
I did think up 100s of radio telescopes in a bird cage orbit at the distance of Jupiter, impractical of course but Space VLBI does reward thinking big.
Isn't it worth having telescopes well out the ecliptic plane, I seem to recollect VLBI is about filling in the UV plane. It was a long time ago, and it was just a second year physics project.
[0] - http://www.artscatalyst.org/astro-black-morphologies-flow-mo...