While in principle what your are suggesting sounds great the logistics of it are impossible. You are asking every LFS, wholesaler, and every hand a coral might touch from the ocean to our hands to now become expert level reef keepers with the capability to hold, maintain, and treat, acropora for up to 6 weeks per stop.
The logistics are not impossible, just difficult. Saying there is no solution is a sure way to make sure there will not be a solution. It was once thought to be impossible to even keep Acro's alive in a tank, but it wasn't impossible, someone figured out a way to do it. That never would have happened if everyone took the mindset that it was impossible.
Learning about pests is a part of learning about keeping SPS. I'm just glad these days we know what is eating our corals because when I first got into SPS, AEFW and Monti eating nudis were unheard of by most of us. SPS is the most challenging aspect of reef keeping. It's not for everybody. The commitment we need to make in terms of time, money, and equipment is bigger and riskier then all other aspects of the hobby (maybe not NPS).
I remember a time when you could walk into a LFS, buy a coral, put it in your tank and not worry about what may be on it. The redbugs I got came from a friend who didn't know he had them, or was giving away free samples of them. We know a lot more today than we did 10 years ago, and unless we stop trying to improve the hobby we will not know more in the next 10 years.
I guess to me what it boils down to is. If you are going to dip, and qt every piece you get from wherever you get it. What does it matter if the LFS does the same? What does it matter if the coral has pests, or doesn't. If you treat them all like they do then the end result is the same.
What if the LFS wasn't getting them in the first place? What would happen if people started saying "I will not buy your corals unless I know that everything possible has been done to prevent pests"? What would happen is suppliers would start losing sales and either take the matter with some seriousness or they will be replaced by suppliers that do. It is really simple, the demand dictates the supply, in virtually every business. We would still treat and QT, if we are smart, but the pre-existing damage will be lessened. Wouldn't that be a good thing?
It matters because corals are being impacted and damaged from the first bite taken by AEFW, so damage is being done long before we get them. Would it be better to just treat cancer or find a way to prevent it? I cannot imagine anyone who has been in the business being ok with pests being sent down the line. Do we really think it is a good thing to have the entire chain infected before the corals reach us? Is that really acceptable? Why is it acceptable in the coral trade and not in any other animal related trade? Perhaps because far too many just do not care and think it is impossible to do anything about?
The person or company who finds a way to offer pest free corals and fish will make a killing because people will pay for it. It should not be a time thing, in the timber business you have to keep your stock healthy and growing for decades before it becomes economically viable, that has not stopped timber companies from doing business, or making a profit or finding a way to produce trees.