These new forks for “slightly bigger wheels” will still take 26″ wheels easily…
So that leaves tubes, tyres and rims…
Seems to me that you can’t even buy “slightly bigger” tubes in the shops, and 26″ tubes stretch to fit… so… either 26″ tubes will always be stocked in the shops, or you’ll be able to bang in a “slightly bigger” one anyway.
So that leaves just tyres and rims…
I can’t see either going out of production during the life of my 26″ bikes. Still easy to get all sorts of weird Euro sizes of tyres and rims that you never see on a bike made by any major manufacturer.
What I can see is “new” ideas (gimmicks) in rim and tyre technology being made in only two sizes (ie not 26″).