I have both vintage machines and newish ones. My vintage machines are, of course, still running strong. I have a 25 year old Bernina that I love and pray that it keeps running for a while longer. My newest one is a Juki QVP 2200 Mini. I've only had it a year and a half so far so good.
I really think it depends on how much use it gets. My Bernina was my only machine for 20 years. It got a ton of use. Now that I have 7 machines, no machine gets used a lot so I'm hoping for more longevity. One thing to keep in mind is that computerized machines will only last as long as the electronics. Same goes with cars.