Future of iTunes and audio files in its library I still have most of my music on CDs. This has been fine, since I mostly listened in the car. Since I retired recently, I am driving less and would like to put the CDs into iTunes (mostly for my iPads and iPhones). I have already put a small percentage of the CDs into iTunes. Now, I am considering putting the remainder (~200) into iTunes. 

But, now that there are rumors that iTunes will be discontinued, is this a dead-end?  Most of the existing files are ".m4a" files. Any recommendations?
It is not a rumor - it has been officially announced by Apple that iTunes is going away. It is going to be replaced by Apple Music, Apple TV and Apple Podcasts in the next release of macOS named Catalina.

In practice you'll just start using the Apple Music program for listening to your old ripped CDs instead of using iTunes - so this is definitely not a dead-end. Your iTunes Library will be carried over automatically.

Catalina Features