I always had an inkling for a Search Engine that ONLY indexed the root page of every domain. Not sure if I'm right about this, but it sure would sort the chaff from the wheat for general purpose queries.
I would almost want the opposite. The best content on most topics I've found tends to be a page on a discussion forum of some sort, followed by blogs and more general editorial sites.
So on launch-day you would have checkboxes. On the one-year anniversary you´d have those checkboxes removed.
Google probably implemented this a couple of decades ago, though, so what we _really_ need is someone to come up with a new business model more attractive than Google's.
Ad-free is quite refreshing.