Agreed - If it had been Ogg Vorbis or some other format it would have been better - But that's not the way it turned out, and as such we should support MP3s so much that developers are helped to improve it, and to work on the next phenomenon.
The fact that you're not advocating Minidisks etc, shows that you're not all about the quality - And that you agree that accessibility practicality is a factor aswell, CD is not the best quality, nor is it the most practical - But MP3 is certainly the most practical, but surely not the greatest quality.
MP3 is not a step in the wrong direction - Its just a step into ANOTHER direction, yes its worse quality, but its so damn practical that personally I don't give a damn. My CD walkman sounds no better than my MP3 player - Nor does my tape recorder sound any better than my phone - But I know that when I get home I can whip out a CD into my big hi fi system and play music at quality where practicality is not an issue.