It's a classic song, but it wouldn't have affected Pac at all, it's a brilliant record which I've always loved but they didn't even say his name, even though it's obvious who it's about, but that wasn't going to work against Pac, who was much bigger than them, Pac would have gone at them hard and relentlessly, eventually it may have got squashed due to some mutual connections but I don't think Mobb could have beaten Pac, I think Pac's more of a battle/diss rapper than them, when Mobb did it it normally seemed a little out of their comfort zone, infact they mostly do subliminals, Pac went direct, hard and raw which I think would have won him it. All legends though.