I rarely research Future Tech. Like nate and zeise, I drop my research to zero and spend my money on culture instead. Why spend a whole lot of time to get 1 happiness in each city eventually when you can crank the culture slider to a mere 40% and get 10 happiness in each city instantly (4 + 4 from Theatre + 2 from Colosseum)? Setting it to something more like what research would be set at, like 80%, gives 20 happiness per city. Therefore, Future Tech is only worth the trouble if you either really need the health, intend to quickly research about twenty of it (which I don't, near the end of the game, plus I have gold reserves to build up with lower culture settings), or don't have Theatres and Colloseums in your cities (that late in the game there's no excuse).