I should be happy about this -- who wouldn't want the entire web to be encrypted -- but SSL is so broken for normal people. SSL is expensive (wildcard certificates run $70 a year and up), confusing (how does one pick between the 200 different companies selling certificates?), and incredibly difficult to set up (what order should I cat the certificate pieces in again?). If SSL doesn't change, this move will cut the li…
Major browser vendors like Google and Mozilla don't change their policies in a vacuum while the rest of the world stays static. The move to "deprecate" HTTP is an explicit attempt to manipulate the rest of the world into making SSL easier and more affordable. It is unfair to evaluate this proposal in isolation without considering the market upheaval that it is very much intended to trigger.
Currently, most web hosts charge a hefty markup on SSL certificates and charge even more to enable them on a website hosted with them. This practice may no longer be sustainable as more and more people begin to demand SSL. "Free SSL with every 1-year contract!" could well become a standard marketing slogan, just as "Free domain with every 1-year contract!" has been for the last 10+ years.
Some domain registrars already offer free or low-cost (~$1.99) SSL certificates with the purchase of every domain. This may become more widespread as registrars scramble to remain competitive.
Android 2.x and Windows XP are major excuses for not adopting SNI, but the upcoming release of Windows 10 will reduce the market share of XP even further, and old Android's lifespan is also running out thanks to the planned obsolescence of mobile devices. By 2017-18, nobody will care about these platforms anymore, and if anyone still does, we can tell them to get Firefox.
Even without StartSSL or Let's Encrypt, existing CAs may be forced to cut their prices drastically as a horde of super-price-conscious consumers begin to flood their once prestigious trading floor. Some CAs have already been offering $20 wildcard certs through selected resellers. Expect more of these offers in the near future. This is a race to the bottom, and I'm thoroughly enjoying it!
To top it off, CloudFlare is offering free SSL (SNI required) to everyone. Expect services like this to become more common as SSL comes to be seen as an essential component of every online service.
Of course, there's no guarantee that these changes will occur. But I can guarantee that most of them will not occur unless there's massive, organized presssure on the lazy, greedy incumbents. Google and Mozilla are doing the world a great service by adding their weight to this much-needed pressure. Remember when the rest of the world basically ran an extortion racket to force the web hosting industry into upgrading to PHP 5? That was glorious. I want to see it happen again, this time for easy and affordable SSL.
If the deadline arrives and the world still isn't ready for the transition, we'll think again and adjust our strategies accordingly. Nothing wrong with that. In the meantime, let's be optimistic and go bully some web hosts!