Grand Theft Auto V on Xbox 360

I am currently low on cash and have enough to purchase the 360 version of GTA V.  I want to start off by saying I don't care AT ALL about the online portion.  All I care about is the single player campaign.  With that said, I know that Rockstar has stopped updating the 360 version.  Would I be loosing anything really in single player and are the upgrades of any substance beyond the general graphic upgrade of the PC or Xbox One?

Dude you'll be fine. Yea there is a slight graphics and,framrate decline the game is fun regardless. Online is still there If you want it. To me,the graphical difference doesn't take away from the game.