The membrane seems to be working tho, there are less complaints about the new keyboard. The key travel is less for a reason, that was intentional on Apple's part. If you don't like the keyboard that's fine, there are a few who don't! personally i've tried it in the Apple store and on a friend's MacBook Pro from 2016 and i actually like it, i can type a lot better without missing keys. Each to their own i guess.
Personally i wouldn't have a problem with them putting the butterfly keyboard into this new 13" MacBook/Air, which is something they might very well do, especially if they are upgrading everything else like a Retina display and thinner bezels.
Not long until we find out now anyway