Manufacturers work on a 7 year turnaround on producing new models, this is what Ive been told (might not pertain exactly to a mill),is that the serviceable life is about that long depending on use, BUT most manufacturers will not provide parts on legacy machines they have discontinued. I had a lightly used motion 1 that I used for 5+ years and now its enjoying its second life in mexico for the past 3 years, still churning. I buy all my mills used now, almost all had less than 100 hours.. the only mill I bought new, it was dead in less than 3 years of light use, no service for it, no parts for it.
So, beware.. Id rather be driving a new car now for the money I wasted, it would only have 50k miles on it..