Here's my prediction when it comes to PlayStation through 2021 (I'll leave out some of the smaller games and details):
2019: Day's Gone, Dreams, The Last of Us Part II
2020 (PS4): Death Stranding, Ghost of Tsushima, The Last of Us Part II standalone DLC
2020 (PS5): PS5 reveal event in Q1; $399, Horizon 2 and Gran Turismo Open World as launch games in October/November, full Backwards Compatibility with the biggest PS4 games getting PS5 enhanced patches. Cross-gen games will not exist, instead games launching on PS4 in late 2020 will just get a significant PS5 enhanced patch
2021: God of War 2, Spider-man 2, Horizon Zero Dawn 2 DLC