I can’t answer the question, but just to comment…yes, Google is starting to include SSL (https protocol) as a new ranking signal, but important to understand that it will carry only a fraction of importance (~1% claimed) to start and will probably ramp up slowly.
Strong architecture, easily crawlable, and great, unique content will still be the dominant focus.
Obviously moving to SSL presents other challenges, including potentially slower response times, which also runs counter to Google’s focus on faster load times as a quality signal, not to mention that it may be more costly and technically more complicated to get right for most sites that have not needed SSL for traditional reasons like sensitive, personal information such as banking and finance sites, ecommerce, etc.
Good question to ask, but I wouldn’t advise anyone to rush into this.
Cheers