That's easier said and done with movies and tv where the enjoyment isn't dependent on player base. For multiplayer games at a certain point you have often have to move to the newer versions.

It will never rot so completely that's its never not salvageable. Imagine some alternate universe that 343 actually hired people who knew what they were doing and they created a new Halo that was as well received and as talked about as much as the first Halo. That shit would fly off the shelves, sure it wont be pre ordered (nobody should ever pre order anyway) but it will sell and sell and sell once word gets out.

This is what the cling to as they try to make a successful game, despite having as much understanding as to what makes a great game as my dog does of planning a manned mission to mars. What happened was they confused the people pre ordering and buying the game off previous quality games for actual talent in game development, so they endlessly try repeating what they did previously and it just works less and less. Meanwhile utter tools add DLC of ever lower value, loot boxes and skins, to squeeze a bit more cash out of those not quite ready to give up on the series.