Here is how I see it. The Refit in no way is an admission of the A-wing being overcosted. What is happening is that the A-wing's previous role was being replaced by the Z-95. The Z-95 can accomplish the role of cheap missile carrier and cheap filler ship in a squad far, far better than the A-wing. No matter what the A-wing proponents advocate. The 5 pt difference was going to be too much for many people.
Now, with the Refit, the A-wing can compete with the Z-95 for the filler role. As for the Missile carrier, I think it depends on the ship. That's where the A-wing Veteran comes in. And extra Elite Talent can be helpful for getting off a missile. And I'm certain the Proton Rockets are going to challenge the benefits of the Refit.
In short, the A-wings are now going to be seen a lot. And that is a good thing. I still the benefits of a missile on the A-wing. An extra source of damage on your new very versatile ship with 2 Elite Talents is going to be fun. I like the tough choice.
As for Keyan. Dear god. Just stop. Please. He is good. No one is denying it. But he doesn't invalidate anything Imps have gotten or going to get. Stress has never been as big a deal on Rebel ships as it has been on the squishy TIEs. But he is still an expensive B-wing that goes down so, so easily. I don't see how Interceptors can't stay out of his sights.