Well, those are major words... IMO it won't be that easy or soon. Roland, Moog, NI, Steinberg, etc, are light years ahead of web audio. The web audio API direction is good and really promising tho.
I'm really excited about a combo of Node/websockets (real-time), NW.js/Electron (GUI), Emscripten/ASM.js (reusing audio libs) and Web Audio API. Amazing things can come out of this.
There's a ton of awesome stuff happening in WebAudio right now. If you want more, check out http://audiocrawl.co