Depends on your definition of "high-speed." I still think of that as meaning anything faster than dialup. The front page of wine.com is 4MB, which would take ten minutes to load over a 56k modem, so in that sense it doesn't seem wrong.
Also, blind people still use the web. So, that feature is not going away any time soon.
Wine.com does not need broadband to be widespread. Widespread broadband lets it be a little bit prettier, and the devs are too lazy to care about exceptionally slow connections. Without widespread broadband, wine.com would be the same, but with smaller pictures. Without widespread broadband, twitch would not exist, and youtube would be crippled. Those are the sites it enables.