Here's how you can tell you've run out of ideas for "Oceanic Future" and it's time to move on to Lunar Future or whatever:
Pendulum Oscillation - a technology that can only be researched 4 ages into the future (Tomorrow, Future, Arctic Future, Oceanic Future) - that allows you to build - a tire swing. Seriously? A freaking TIRE SWING? We had rope in the High Middle Ages and tires in the Industrial Age. The Oceanic Future has run dry. Move on.