Is CS truly so good that any change which forces someone to re-learn the ropes is unwelcome? Do they want to keep playing the same game for another decade?
I think they probably want to keep CS at least on core level same for more decades. It has been around this long so something must have been done right.
I know the obvious answer is "well, chess hasn't changed (much) and people play it for their entire lives". And yes, I would eventually find chess boring too!
Chess is the obvious comparison, but also so is any major sport. There hasn't been anything significantly changed about Soccer, Basketball, Baseball, and so on, in a long time as well and most people don't have issues with that. Once you eliminate changing the game rules you're left with only trying to develop your own personal skills.
(CS dropped from 10 bullets to 5)