Never going to happen. 3 years ago a petition on rockstar support got tens of thousands of votes to bring Heist vehicles and flare gun to single player and they deleted it. The same people made the petition again and once again received tens of thousands of votes only for Rockstar to take it down once again. If you ain't online and or spending money on a shark card your just a filthy freeloader in their eyes.
I'm considering starting a petition to get R* to add some of the new Online vehicles to Single Player.
I've bought and modded every car in single player, and I want new cars.
I know mods on the PC exist, but I'm cash strapped as hell. I know others will be in the same predicament.
Then Rockstar can go f*ck themselves. I'm refusing to buy any of their future games, and I'm done with GTA Online.
If Rockstar had made a DLC for GTA V they may have made just as much money as they have with Online. Sad.