Not now, not ever. If you use bleeding edge technology, I probably won't like your site. Don't use it unless you need to use it to make a point you couldn't do any other way. Push the envelope in another direction. If you are a developer, tough.
Most users are average.
I am average. In most cases, you should cater your site to me. Don't tell me that you can solve all of my problems through your web site. I don't have faith in you, and you are not my religion. You can't do everything for everyone.