I had a long think earlier, ...long.

KY and PD need to change their plans for GT5 following the GT fanbase's reaction to the E3 2010 news. This won't be the perfect scenario but the best option and future proof.. Two completely separate games on 2 Blu-ray discs, sold as one, under the title GT5 and still keeping the release date for November 2010.
GT5 (The path that KY and PD should have followed in the first place, back in 2008)
-Over 1000 standard cars, including the premium cars still in the game but in their standard form
-3D wheels, like in GT4 Photomode
-3D drivers with a range of GT inspired overalls and helmets to pick from in a GT Apparel section
-All car aerials modelled on the standard cars
-Real lights featured on the standard cars
-Black or simple textured undercarriage for all standard cars
-No interiors, just a steering wheel, 2 front seats and a dashboard, all generic, black and untextured
-Motion Capture used on the driver to actually turn a generic steering wheel but no gear changing animations
-Tinted windows just right to match the 3D driver with the generic interiors
-All convertible cars with the roof up to avoid problems with the generic interiors
-All open wheel cars with the same generic interior
-Visual Damage that allows only for dents, scratches, cracked lights and windows
-Physical damage and terminal damage simulated
-Damage settings either on Arcade/visual only or Simulation/including physical and terminal damage
-No NASCAR or WRC licences included
-GT Rally mode similar to GT4 in standard form with standard damage
-No day and night transitions and no high beams
-Night races with low beams only, like in GT4
-Ability to upgrade the mechanical parts in GT Tuning section and to see Street/Sport/Race exhaust mufflers visually on all standard cars
-Ability to see a generic, black, untextured rollcage and removal of the passenger seat if these upgrades are performed in the GT Tuning section
-In GT Aero section the ability to upgrade some standard aero parts like a few types of canards, front splitters, rear diffusers, rear wings, different exhaust mufflers and bonnets, with the option to have them in CF, all with an actual physical aero effect simulated
-GT Paint section allowing painting all cars in any colour
-GT Valet and GT Repair sections also included in GT Career mode
-More simplistic and less expansive tracks
-3D spectators and trees in the foreground and 2D versions in the background
-Real time skidmarks
-A more used, dirty and imperfect looking track surface
-10 cars on track online and over 20 offline
-Sounds to represent backfire pops and boost valves letting off pressure
-Arcade and Simulation physics
-Benchmark tool to calculate instantly 0-60Mph, 0-100Mph, Top Speed, 100Mph-0, 60Mph-0, 0-1/8Mile, 0-1/4Mile, and lateral g at 60/100Mph
-Premium physics including rollover, gravel and grass particle effects, tyre smoke, AI, motion captured 3D spectators, marshals and pit crew, back fire flames
***Comprehensive QA to ensure any bugs, glitches, exploits and errors are fixed in regular and timely patching (for both games)
***Commitment and promise that anyone that buys GT5's GT Premium DLC will get standard versions of any completely new premium cars added to GT5 for free
And
GT5 Premium (The future of GT, KY and PD's genius vision)
-Over 200 premium cars
-day and night transitions
-high beams and ability to turn them on and off
-Premium car interiors and damage
-NASCAR and WRC licences
-Another GT Career mode based purely on premier cars
-Visual transformation of premium cars as performance and weight reduction upgrades are performed
-Licenced body kits, all with an actual physical aero effect simulated
***Commitment to release more premium cars and more tracks in the form of DLC/not free until all the standard cars are premium and adding the occasional new ones
***Commitment to add dynamic weather in form of DLC/not free
But KY and PD have to start outsourcing car modelling work to ensure the DLC for GT5 Premium is coming in at a decent rate to please GT fans, perhaps over 40 premium cars every 3 months, over 160 per year and aiming to have all the standard cars finished, plus a number of new ones, in 5 years. A steady stream of revenue with no publishing costs, to make a profit and cover developments costs for Sony from the millions strong GT5 fanbase. Then, GT6 is released in 2015 with all the premium cars and tracks released via DLC so far, plus some new ones, and Porsche licence! The sales of GT6 would fund GT7 on PS4 which is probably when KY will finally achieve his vision of the almost perfect GT.
Now please tell me this scenario as I have painstakingly depicted is not achievable and does not make your mouth water fellow GT fan?