He is thoughtful and states his case well, but these two assertions make no sense alongside one another: But it would be useful to a lot of people -- hundreds

He is thoughtful and states his case well, but these two assertions make no sense alongside one another: But it would be useful to a lot of people -- hundreds of millions of people who you may never know. Microsoft Windows is the biggest laggard; they drop any packet whose destination OR SOURCE address is in 240/4. We can assume he's not talking about mobile users: they can and usually do get IPv6 addresses. We can assume he's not talking about all the endless servers and so on talking to one another, those aren't "people." He's talking about hundreds of millions of PC users. Hundreds of millions of PC users, except Windows users. How is that going to work? It'd be fun and ironic to pick on Microsoft for adhering too closely to established open standards, but unless I'm missing something here, they've got a veto over implementation of these ideas.