When WoW was declining due to one crappy expansion after another featuring accessibility-inspired dumbing down, some people tried to write this off as not being about the content, but just due to ‘burnout’. They would have you believe that after 1, 2, or 4 years, people were just getting burned out on WoW and that’s why sub numbers were declining. The counter point the entire time was EVE, but now you can toss WoW itself into the mix.
Related is this recent info about Payday 2. The highest activity in the game, which is now more than a year old, just occurred this October. Perhaps FPS gamers are just immune to burnout? Or maybe its because the content that is constantly added to Payday 2 is fantastic. Deathwish difficulty raised the bar and gave even the most experienced players a real challenge (or for most people, an unreachable/impossible tier, which sounds vaguely familiar to something else…), the mix of paid DLC and free updates have been solid and steady, and the game today doesn’t just have more ‘stuff’, but it has more stuff that fits and actually expanded all of the original content, rather than replace it (now where have I heard about that approach working long-term…).
LoL (4 years+, peak numbers), CoC (2 years+, top grossing app today (oddly Hearthstone didn’t show up in the top 150 for either downloads or revenue, wonder why)), DoTA2 (crazy growth this year), etc etc etc. I think you get the point.
If a game is great and keeping being great, while giving you more of that greatness, you don’t get burned out. If a game stagnates, or especially if it gets worse (hi Trion), people leave because of that, not burnout.