This is happening on Bandcamp already. A smaller label called Jade Tree put their entire catalog up there and as a fan of the label it was awesome to see them do this.
Back to your point with labels, they do benefit the artist despite it seeming like they don't. While 360 deals may be worse for the artist the labels provide them with a recording studio, mixer, producer, distribution, endless supply of industry contacts, merchandising companies, etc.
Side ramble: I've never understood why people paint "real" bands as being lo-fi, guttural, punk and romantic. It's a goddamn privelege to afford all that equipment. Here's your true punk: pirate Ableton and upload a tune to YouTube for free.
Back to the point, for a lot of styles, the only point of a label is marketing. But this can be a very useful tool -- even just acting as a quality filter is useful.
I know people doing electro, and they pay people to do this job. It is really hard to do it correctly.
Even people like DeadMau5 and Daft Punk do not do the mix/master by themselves. They just monitor the people doing it (look at some of their interviews).