I’ve been using Wifi and carefully analyzing it’s behavior and performance for both audio and video streaming, and I think this is a little unfair:
IMO, even if you pour a bunch of money in your wifi, it will not be as stable as a wired connection.
It really depends on a lot of things, like how congested your wifi neighborhood is, and where exactly your router is and the quality of the signal. I live in the burbs and I can easily do wifi for audio or video here. 4 other competing signals and 4 bars of signal strength. In my San Francisco apartment though, I couldn’t stream anything. :D
I do generally agree that those are the only two options: Optimize the router channel and placements, and have a hard wire run. The latter of course is best. :)