As someone who has bought all of GTA games and the extra episodes and add-ons over the years it saddens me that there hasn't been at least one single player exp

As someone who has bought all of GTA games and the extra episodes and add-ons over the years it saddens me that there hasn't been at least one single player expansion for GTA V. I have absolutely zero interest in GTA Online but have completed the single player story multiple times both on Xbox 360 and PC. I imagine it's far too late in GTA V's lifecycle for them to announce something now, and it's a real shame.