You don't need any of that for a reasonably fast Internet which is basically all the tech you need. You can burn through SPs really fast using massively many GWAMs and winning the WF.
I guess it depends on whether you're playing multiplayer or singleplayer. In multiplayer, you need fast tech to make sure you get at least one free Autocracy tenet to select Futurism; if you work your guilds just enough to generate a GWAM the next turn they are worked and wait until Futurism to spawn your first GWAM, you'll maximize tourism output. You also need the fast tech to make sure your opponents generate as little culture as possible before you hit them with the big Futurism hammer. Since human opponents will catch on pretty quick, you'll want to end the game fast once you start on Futurism; if you ever make it to Cult of Personality, you've probably taken too long. In fact, AFAIK, Futurism is pretty much the only way to win CV in multiplayer, with Sacred Sites gimmick placing a distant second (your opponents just have too much time to prepare). Also, IIRC, Futurism's tourism bonus isn't adjusted for game speed, so you'll get the most out of it on Quick.
In singleplayer at higher difficulty levels, AIs will generate so much culture that Futurism won't be enough to win you the game alone.
Either way, if you're going to finish a policy tree to make the most out of Futurism, why not go for Aesthetics instead? Patronage's finisher might net you three or four free GWAMs over the course of the game if you're lucky, but Aesthetics will let you purchase at least twice as many GWAMs with Faith in addition to boosting your GWAM generation by 25%. Plus, if you time it well, you could even leave Artistic Genius for last and pick it up right after you get Futurism.
I'm inclined to agree but I'm not sold on the idea, there's untapped potential in Autocracy CVs that I simply never get around to test out. If the Cult of Personality adds 50% per common enemy, that makes it all kinds of broken and for a limited amount of time you can stalemate the world while having a makeshift Carnival to help catch that runaway
Cult of Personality does indeed add 50% per common major civ enemy (CS wars don't count), even if you are at war with the civ; the multiplier is additive, so if everyone is at war with everyone on a Standard map with 8 players, you'll get a 4x multiplier on tourism to all players (each player is at war with 6 other players who you are also at war with). The multiplier is also additive with all other tourism bonuses (trade routes, open borders, diplomat in capitol, shared religion) except for Internet, so if you already have +50% from shared religion and open borders, it'll be a 4.5x multiplier with Cult of Personality.