This doesn't necessarily have to be at the UI level. If sites have a well defined API they can still be indexed but serviced for users by native apps. In fact, this is better than kludgy scraping.
For that you'd have to have a standard API with indicators of content importance. Even then it would be akin to keyword meta tags which are bad representations of site content in general.
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This open source characteristic is also vital for search engines, data aggregators, and general interoperability on the web.
This doesn't necessarily have to be at the UI level. If sites have a well defined API they can still be indexed but serviced for users by native apps. In fact, this is better than kludgy scraping.
For that you'd have to have a standard API with indicators of content importance. Even then it would be akin to keyword meta tags which are bad representations of site content in general.