When you look at it closely, things aren't so bad.
Who uses D-76 replenisher anyways?
I also wonder who buys D-76 in 10 gallon packages (and how do you mix this much? )
I've never seen PhotoFlo 600 on the shelves and can't foresee ever being able to go through a 1 gallon jug of the stuff one capful at the time!
The others like Sodium Hydroxyde are mainly used for making some other chemicals...
I noticed they are discontinuing either products that don't sell much (like DK-50) or things sold in very large volume (50 liters of Xtol

)
So I don't think there's much to worry there, unless you really miss the stench of Kodak Sepia Toner

(and if you do, I have the formula to make your own)