A possible reason is when I was at secondary school ('80-'85), a lot of kids my age took the piss out of me for liking The Beatles as square and old-fashioned.
I'm 43 now, and a lot of those kids now have kids of their own who probably don't know the music of The Beatles as their parents didn't have any of their music themselves.
On a wider issue, I don't think kids are into music the way I was during the ages of, say, 11 to 17-ish. Intricacies like "Are you a mod, punk, skin, ted, rocker, new romantic, casual?" Or, if you did one thing that deviated the "rules" of any of the above, you wern't a "proper one" Or, how can you like The Beatles and The Rolling Stones, Duran Duran andSpandau, or Oasis andBlur?
Music has much more of a wall-papery existence now. Everyone accepts it exists, its sen more of a career-move now to be in a band rather than a radical action, and no-one is interested in looking under the skin.
So, I'm not surprised that people don't 'get' The Beatles, and I don't think there will be any more musical revolutions either.
So, its just us message-boarders left.
Merry Christmas!