A machine can throw a fastball at speeds well above what humans can do. That doesn't mean we retire pitchers completely and end the game of baseball. A car can cover 100m in a fraction of the time humans can, doesn't mean we end track and field.

Chess is a game between humans and that's what makes it exciting.

And with computers we have a whole additional layer added where we can see what an essentially perfect game would look like and compare to that (although computers can still occasionally be surprised by human moves).