You may have missed the point. Building an application around this would be a mistake, since this is a vulnerability that needs to be fixed. There is no way it can be OK for random site visitors to disclose a profile of other URLs they've visited.
just because it shouldn't be done...doesn't mean people aren't going to use it to make money. and how long have browser people known about this and done nothing? this will be a privacy issue for many years to come.
It's hard to fix without breaking things, so, unfortunately, we're going to have to wait for something very bad to happen before it gets fixed.