Even though I have Wi-Fi at home, I still connect through a cable to keep connectivity as strong as possible.
Also, as some people mentioned, it's important to make sure that people have a good microphone. Other standards should also be developed. People could make sure that they turn off their microphone when they're not involved in the discussion to keep noise down.
A little more planning would also be a good idea, with tests done prior to the meetings to ensure that the sound and the Internet connection are good. That's what will really have an impact on intelligibility during meetings.