Fox are still listing new 1 1/18th 26 forks.
I spoke to Mojo about this, and they initially laughed but, said perhaps in time although the majority of their forks listed are for 26. They have a huge stock of steerer units and lowers – you can still get canti-mount lowers for the first generation Fox 26 forks new! Also, they did say that 650B forks have a chassis that can be used for 26. And, of course if you have 1 1/8th then fit a Chriss king headset -nuff said!
I wouldn’t say it’s not a concern but the market will decide the future of 26, if you go with the hype as manufacturers want, all buy a new bike in 650 or 29 flavour!