The Issues with the NSA
I say that this is now a requirement with more and more information from leaks with Edward Snowden. Thing's are not getting better in that aspect, it seems like the more information comes out, the more it is getting worse.
An example of this is the NSA wanting to infect millions on computers with Malware.
Adding support for
https:// and forcing all content can help security and keep this from happening, because they can't tamper with the content which is being served up to us.
Issues with Net Neutrality
Also, with net neutrality being a major issue within the United States, StackExchange can be throttled down for users who are on it quite a bit posting questions, answering questions, commenting, and viewing questions.
https:// here will also keep them from discriminating against what sites we are viewing, what we are doing on those sites, and everything we do online.
I think it should be a requirement, without a second though, as the future of the web is at stake.