Well, I agree that it would advance every character, but I don't think it's necessary for every character if it drives up cost. If say Dutch cost $10-$20 more to have the technology, I'd rather save the money. I don't imagine getting that much more enjoyment out of him if I could pose the eyes than I'll get from the figure as he is. Joker's a different matter, for my photography, which is the biggest way I enjoy collecting, posable eyes will offer me a wonder of opportunities to capture the character and present him as he was in the film. Captain Jack Sparrow is another character where I feel this technology would be well used.
Again, the anit-posable eyes mindset I have is IF that technology drives the price up at least $10 from a standard figure. For one figure, sure that's not much, but over 6 or so figures a year, that adds up and could help pay for other collectibles. If the price is less than $10 difference to have that tech, then yeah, put it in every figure.