Why wouldn't speakers last for a very long time? Apart from replacing the foam surrounds and capacitors, or perhaps re-magnetize the magnets, I haven't and I don't know why you would need to.
How long should high quality speakers last?
My Zu Omen Def MKii (rev B) are going on 13-14 years old. The speakers sound wonderful. I have no intention of parting with them. The speakers came with the latest ZU tweeter design. How long should I expect the speakers to last without any issues? I do not abuse the speakers and run them with my Luxman 595ase amp.