There is no doubt the later in time you go, the better for music listening. As previously said, you can always listen to stuff in the past and filter out what you don't like. You can't listen into the future- yet. As for live performances, you could argue that it was better 'back then'. It was more about the artist rather than the production: No lip-syncing, no sampling, no pre-recorded tracks, fewer stage props, and artists that played instruments.
As for the hardware, no question it's better now. We might pay for it all in the near future; but cheap imports mixed with ever increasing technology has made it a easy to enjoy high quality music playback virtually anywhere. My dad could never have imagined being able to listen to near-audiophile grade sound while at work.
As for recorded music (what it's all about), we've never had better access to so much music and the ability to share that passion with people halfway around the world. And just imagine trying to organize a meet 30 years ago!
It's always easy to want the things you don't have. But I think we're in a pretty good place right now.
Oh- and as for those Oricon charts, as much as I've tried I just can't seem to get into J-pop (and I'm Japanese). But I was somehow able to sit through a few of those videos. 