People forget that Stanley #4 plane hasn't really changed in over 100 years. It's still one of the best tools out there.
We dumped CVS because it was a poor tool, for the time. Subversion was better. Then completely distributed systems became better, because connectivity and computational power came about.
I have some of my great-grandpa's carpentry tools, and I use them often. I guess I should go out and replace perfectly good tools with new stuff from a big store like Home Depot or Lowe's?