"We fear the unknown." "Rather the devil you know, than the one you don't." I'm sure there are more old sayings that could be applied.
I think it is good that there is spirited discussion about big changes like these. It helps things get sorted out. And I believe that things will get sorted out. Looking back at some the things I used to worry about:
- Windows registry as a single point of failure causing widespread chaos: Nope, it seems to be resilient enough.
- W2K raw sockets overwhelming the Internet: Never heard about it being exploited.
- Pulseaudio hogging resources and dragging down my system: Nah, it works well and gives me access to more features of my sound system.
- KDE4: It took years, but now it is good. And there were plenty of alternatives all along.