I don't see the problem with this idea ...
Good move, Google, go for it.
To those who think this is stupid, let's be clear on one thing. It's the current implementation of HTTPS that is broken, not the idea. The idea of using secure, encrypted, communications to obtain privacy and security remains a sound idea.
So, likewise, the idea of us upgrading all of our Internet communications to a secure system is a sound one.
OK, now we have got that out of way, lets think about implementing the idea of a secure communications channel for all Internet traffic as a process with many steps, not something we achieve overnight
All those HTTP websites that everyone is going on about, those will go away within a reasonable amount of time. No company worth doing business with will want their customers getting those kinds of warnings. I think the hosting companies will deal with most of the non-commercial websites, if not willingly then they will eventually be forced to do it for all users by a noticeable minority who complain or ask their hosting company to do this.
If this, somehow, managed to put pressure on ipv4 space, that's GREAT! Why on earth is that something to complain about? The sooner we move over to using ipv6 exclusively, the better, right ?