Yes, they can become outdated, both in the sense that they no longer perform to their original specifications, and that they can be surpassed by newer technology. And yes, they will eventually require repair or go past that point. 14 years is probably not a problem, but if you keep them long enough, it could be.
No, in the "can't live without" sense.
Speaker makers vary wildly in their development process. Some build the same speaker for years or even decades. New models may share little with their predecessors, as years of advancements are incorporated.
OTOH, KEF introduced the Uni-Q concept in 1988, and are on the 13th generation. Changing driver materials, geometry alterations, dampers, radial reinforcements, waveguides, MAT, and lots and lots of computer modelling have led to a long series of refinements.
That doesn't mean you need to get a new pair of KEFs every couple of years. It does keep them competitive in a fast-changing world.