they already are. you can easily download flac audio
with a cd, a small scratch means lost data (don't believe me, get a song that has a long stretch of silence in it such as Ultrahymn by Neurotic Fish
if your cd has small scratches, you will see that if you open the track using a audio editor, you will see small distortions due to the scratches.
the encoding on a cd where the music takes up a large amount of space (700MB for 80 minutes) allows it to be more scratch resistant since a tiny scratch may only damage a 1ms of audio or so but it is still degrading the quality.
download the audio that was never a CD, you will get a better quality song
also how many people still have portable CD players and still use them?
why buy a cd just to rip it to a mp3 player and risk having damaged audio due to dust or anything else on the cd when you can get a copy that was released by the record company or the artist them self that is a flac copy?