I think this would be better as a blacklist. I definitely don't find as much abuse as is claimed, but it does happen occasionally.
I don't want to return to a world where I have to refresh my email window to receive new email, or a world where collaborative google docs aren't possible or the whole plethora of awesome stuff javascript has enabled - you can't get that useful stuff without it being abusable, that power can be used for good or bad.
I think the delays in loading sites is also overstated, yes on poorly designed sites, but e.g. my home page which is angular-based loads very quickly, and one of the benefit of doing things on the client-side is that you can cache more and only transmit the data the client-side app needs to use, dynamically.
Blacklisting, not whitelist solves this problem, my friend.