You have to remember that it is you changing as much as the games. When you first played that FPS for 3 months non stop it was your first time, now you are doing it again 5 years later it isn't going to seem as fresh. Yes they can increase the graphics and even the gameplay but at the end of the day you can play more good games than they can make em and this willl be the case for the forseeable future.
Games slowly evolve over decades, when you were young you had 30 decades of games evolution to play with, now you are upto date so to speak it is 1 years development for years play time, so it seems like it is slowing down.
So eventually you are going to get bored. Get another hobby and take a break for a bit.
Plenty of new good games and they are still evolving, just very slowly. Slower than you. So you can't spend all your time playing them forever without getting bored unfortunatly.
I persoanally feel we need more FPSRPG type games. I have stopped playing Aion 24/7 to play Borderlands for a bit, Aion is great but it is a MMORPG at the end of the day, similar to the rest of em, they are 90% all the same tbh. Played some COD4 until I got bored because at the end of the day it is a FPS and is the same as the rest of them also really.
MMOFPS is the way forward for me. Loving Borderlands and Planetside was probably the best game I have ever played.
Has the longevity of an RPG and the short term fun of an FPS.
Some points there that are spot on imo.
