Purchased a pair of Yamaha NS1000M speakers in 1980 and foolishly sold then 34 years latter. Still looked and played perfectly. Never had a issue with them during that time.
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.")