All this talk about Nickelback made think I've never heard them so didn't really know what you were talking about so I watched a few videos on the tube and they're not bad, some good tunes there. I'm going to listen to a few more.
As far as listening to the Beatles in 1000 years time, why shouldn't they. A good song is a good song when ever it was written. During my lifetime we've had vinyl, cassettes, CDs and now digital downloads and I'm sure that whatever technology is developed next all the good songs will be available on it. Just think of the profits to be made selling yet more versions of the same songs.