HBO's Game of Thrones may just be the last traditional water-cooler TV show to actually air week to week on a premium cable channel. As media channels, including HBO itself, move inevitably toward streaming content, and as attention spans and relevancy windows get shorter and shorter, we're also moving away from signature series that take over just about every conversation in the real world. This is all to say that, when the final season of Game of Thrones arrives starting April 14th, it's worth enjoying the time we get with it not only as a final …