With maybe the notable exception of multiplayer games, all games will be at least just as good a year after launch as they are at launch day.
Add to it that in a year’s time there will be enough reviews out there from people who actually played it longer than 5h and the heavy marketing phase will be more than over so it’s actually possible to get a hype-free overview of it, AND the game itself will likely be better than at launch due to bug fixing in the meanwhile and maybe even some content added, and it’s the logical thing to never buy before or at launch and just wait.
However most people have problems with “reward delaying” (and actual psychological term for the ability to wait for something to be more ‘rewarding’ before going for it) and “just have to have it now!” and that just overrides logic (assuming they even took the time to think about it in the first place).