Based on the type of sewing I do - and my lack of the decorative gene - and lack of incentive/desire/funds to buy a $10,000-$20,000 machine, I probably am okay with the machines that I have.
I think there is a big difference between need and want. If one wants a new machine, and funding is not an issue, go for it.
I did acquire some "upgrades" to what I have recently - A Pfaff 1475 CD and a Bernina 930 Record - but those are basically middle- aged machines.