My tractor is from 1996, my hay baler from the early 70s and my hay cutter is even older. These all work just fine even if a little slow. The challenge of not being able to work on my equipment currently outweighs the marginal speed gains I would see on a farm our size. The same goes for nearly all of my neighbors.
The last "new" tractor in the local area was bought a couple years ago by one of the older guys who was buying the last tractor he will ever own and he thought it would be nice to have a top of the line, new, tractor just once.