Eventually, a lot of spacecraft communications will switch to optical systems instead of using radio. The major gating factor there, at least in regards to sola

Eventually, a lot of spacecraft communications will switch to optical systems instead of using radio. The major gating factor there, at least in regards to solar system exploration, is the creation of off-Earth infrastructure to facilitate it. Which likely would be just a small fleet of relatively modest sized space telescopes designed for 2 way communications. Having the infrastructure off Earth would mean that it would be insensitive to weather and would also be easier to maintain contact with spacecraft nearly anywhere in the sky at any given time. Building that infrastructure probably won't happen until launch costs fall but realistically it's something that could easily happen in the next decade or so. And then the available bandwidth goes way up.