There are some old games that I like to get back to every now and then, and also some game series where I play other iterations than the last one. Examples that fulfill both roles are Pharaoh and the original Stronghold, and Age of Empires II before it got its definitive edition (I don't think it counts as old anymore now). But civ is neither. I may start a game of each civ 2/3/4 every two or three years, but I usually leave after 100 turns again and don't come back. I stopped playing VI wit GS's release, and I don't see me getting back to it anytime again - I played two games when VII was announced, and all I got was a mixture of boredom and annoyance.