Yes, I'll probably turn it off. And then when they add some strange mapping API, I'll turn that off too, and then finally when they add a storage API I'll switch to a browser that isn't trying to be everything to everyone.
Until it gets accidentally turned on by a browser update, or by some rogue plugin (wouldn't put it past Adobe actually), or by an optional Windows Update, or by some grayware that I mindlessly install on a computer.
If it's off by default, it should be in a plugin. If you want it, come and get it.