Unfortunately, if I had to posit a guess, it would be that the main "application space" for AR won't be the free and open web. It will be the walled garden appstore(s). You'll have your staple apps, but they will all be self-contained, and the owners of the hardware/OS will have strict controls around the ability to do things like, block ads from their ad network (which might be the only one allowed on the device).

Big tech companies don't like the users being able to control what they see through a browser that can install whatever plugins the user wants. Make no mistake, they want full control over the experience, and have no qualms about doing whatever it takes to own that experience. To not do so enables their competitors to claim a foothold in their territory.