Re: A pretty high bar
I'll be astonished if it becomes widely used by any generation. Requires website to actively forego information, just to "protect" user privacy (from whom, exactly?) I find it hard to think of any business case for that.
Opposition political sites in certain nations.
I can think of a few cases where you want to be absolutely certain that you're not leaving any traces in the user's machine.
The second case is perhaps less strong since activists would want to be using TOR or a VPN, ideally from a TAILS install or non-persistent VM since they need to hide at a network level. In the former case though, making sure there's no risk of leaving a "Women's Aid" logo in the browser cache is a very sound shout.