If you contact Apple after October 2017, it appears they might do nothing for you for free because, according to what I have read, that's when the free screen replacement program ends. Some people have suggested Apple might extend the program, but there's no way to know if they will do that or not.
The inadequacy of the current screen replacement program is that your old screen is replaced with a new screen that has not resolved the core problem. From the active reports I am reading from people who have had their screens replaced, it is clear that the new replacement screen has the same potential to develop the same antiglare coating problem as the previous screen did. This is unfortunate in that it would save Apple a lot of headache, time, and money, and loss of good PR to simply spend a little money to fix the root problem and then replace the screen ONCE and for all.
I have read first-hand report where people have had their screens replaced 3 times and it still develops the same problem. You may also find that an Apple store's willingness to replace the screen once or even multiple times depends largely on who manages the store.
I'd like to close this post by saying I am a lover of Apple products and have been since my Macintosh 128K 1984. I also know that Apple's iOS products are bulletproof in terms of their screens because I've owned many of them through the years and never had a single antiglare coating problem with any of them, including devices that have been used harshly and cleaned harshly by young kids. Perhaps that indicates that Apple would never have had the problem with MacBook Pro screens had they put special coatings on the MacBook Pro screens, such as the anti-fingerprint oleophobic coating. Of course, I've never tried adding such a coating, and it is only brainstorming of what might possibly prevent the problem.