The FAA needs to grow a pair and declare this type certification and all other certifications older than ~30 years EOLed. That doesn't mean you can't continue operating those planes, it just means you can't retrofit some changes onto a deeply legacy model and still call it the same type.
Yes. The A320neo should be the last new design allowed under the same certification. They'll be forced to re-certify whatever they do next anyway, so they won't have to try to shoehorn things into the older design like Boeing did with the 737.