Who needs Adobe Premiere
when you have iMovie, or Final Cut Express, or even Final Cut Pro?
Did you ever use Premiere? I did. Once iMovie came out, I never used Premiere again. Apple's Final Cut Express is a much better program that Premiere ever was.
I would probably guess that hardly anyone bought Adobe Premiere, except for people that were upgrading it, after Apple came out with its programs.
I can't blame Adobe. If they don't make money on the product, why bother.
After Effects, on the other hand, will still be available for the mac, since it offers a lot of features that Mac users can take advantage of.
Apple writes better software for the mac than Adobe does. However, when Apple starts doing their own stuff, the developers lose and drop the products.
It's all a money thing. There has to be a profit.