In the end it's about the music. If it sounds good who gives a monkeys about it's origin? Do we go to rock gigs and say "What a passionate performance. However I wish the guitarist had been using an original '56 Strat rather than that cheap copy - would've sounded better..." If you're dancing, or laughing, or crying, or just feeling so alive you could burst, does it actually matter whether you're listening to an MP3 or a wax cylinder? If the performance or the music itself gets to you, that's all you need to feel or know. The fact that some are complaining here about MP3 inclusion shows that for many people the music comes in second place to the technology.
And someone else observed that now Live supports MP3 "that everyone will be turning to DJ'ing." So what - are you afraid of some young kid coming along and getting the crowd moving more than you did? NEWSFLASH - if it hasn't already happened, it's just about to, whether Live supports MP3 or not. The reason you're worried is that you're not concentrating on what you're doing but what is happening over your shoulder.
"I can hear the footsteps of younger, better looking people, every night on the decks..." (or something close to that) LCD Soundsystem got it right here - every generation will be superseded by the next - and thank god for that. Otherwise we would still be listening to Genesis and Phil Collins would be your hero.
I'm delighted with all the new features promised in V5 - If you're trying to blame Ableton for making an accessible, exciting music production tool that many people can use then you don't love music as much as you thought.
Now go and make some fucking music and stop moaning.
And that means me too.
Bye!