The things you list would seem to be severe disadvantages. I doubt many would go this route exclusively but have a traditional site in parallel. I guess Google

The things you list would seem to be severe disadvantages. I doubt many would go this route exclusively but have a traditional site in parallel. I guess Google and other search engines will let us know when the number of pages turned up by indexing starts to decline or let us know when general web browser installation starts to fall. I don't see it happening.