Those gifs only shows that something went horribly wrong after GT4.
Yes. Split RAM.
And Polyohony's stubborness to develop an angine that can handle all below in the real time with such impossible RAM-overflow architecture:
16 cars on track with scalable physics engine (up to 360Hz fro players car) and full-presence (no CPU "shadowing") with 15+1 vehicle AI, real-time effects of flames and brakes, real-time particle effects (including progressive dirt accumulation on vehicles), real-time smoke, daytime/weather engine with full-HDR properties, real-time ambiance lighting with lens-flaring for both vehicles and surroundings, animated rain with physics properties, animated drivers, movable objects in cockpits, progressively animated vehicles (aerodynamic parts, suspensions and real-time procedural crumble damage, wipers and aerodynamically influenced parts such as antennas, visible progressive dirt accumulation/removal on tyres), on-tracks physics (side-track objects with own physical properties, real-time wind simulation, real-time skid marks..), pit-crew AI, real-time vehicle properties (mechanical damage, tyre and fuel), real-time track properties that influence vehicles and weather-engine (temperature, air humidity, track temperature, surface humidity..), real-time weather properties with own sub-engine (rain changes into light snow for instance on SSR7 track or clear weather changes to light snow and to blizzard on Chamonix..), ambiance effects (fireworks, etc.), real-time background saving of all race-data, parallel sub-engine for FFB HID devices, etc.
And then came GT6 with real-time global illumination, partial HDR, enourmously improved alphas and infamous real-time LOD, all with 1440 vertical resolution on top of the above. And I probably forgot something to list.
They finally have a unified-pool hardware built to withstand all RAM-overflows that can cope with "GT on PS3 Engine" in full array of execution.
They have beast of the engine scaled to work amazingly on hardware weaker than 2015 LG washing machines.
I remain optimistic.