In 1972 when my wife and I were both in college we bought a pair of Bose 901 Series 1, the ones with the drivers having corrugated surrounds. Now half a century later the speakers are still going strong in our son's basement party room. The chintzy little equalizer long since bit the dirt and was replaced by an after market equalizer.
How long does it take a decent quality speaker to "wear out"?
After all, they do have moving parts and capacitors. . . .
(I suppose that "decent quality" s a relative term. FTR, I am running a pair of the older B&W 805s, and for all I know, they may not actually meet the criteria of "decent quality.")