I would have to agree.
I don't see it much different than supporting webgl or the controller which only worked on a few browsers before. But this could be a lot more complicated. I'm talking from complete ignorance ha, but if a beta version of more webaudio functions is possible then it'd be a game changer.
I know 3 serious developers who don't consider Construct an option because of the audio, they all use Game Maker and its FMOD plugin. WebAudio has potential to smash that.