Maybe I'm wrong but, when I consider apps, I also consider gaming a part of the equation as well, since they are the most popular apps. We've already seen OnLive fail because the web is simply not ready to handle the tasks of real-time gaming for enthusiasts.
I think that OnLive is a very bad example to use when talking about web gaming, because, well, it wasn't web gaming. It was an attempt to shoehorn gaming platforms onto the web- little surprise that it failed.
That said, web gaming right now isn't good. But if WebGL becomes popular then there's no reason for it not to become a perfectly usable platform.
