That's a good point. How come we are still using http? I mean, the closest we've come AFAIK to something almost useful is ajax, but that's still not very good considering it's javascript... Maybe I'm unaware of some secret google development.
MIDI is very slow and has a very limited message set. There are better alternatives, like OSC, but it seems like the chances of the music industry collectively acting in its own best interest again and approving a new standard are very slim.