Indeed it could, but most people seem not to even take in consideration that PD wasn't working solely on GT, and in this 5 year span they have released other games as well. Plus, once again, the public has only been truly waiting for GT5 since it's unveiling at late 07/early 08.
You can say that people were expecting it, but the same can be said for people expecting for other games that won't come out or aren't even planned to come out (FFVII remake syndrome).
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"
