I like the SA in the 70's idea. I personally think R* could do a great job making fun of all the pop culture of the 70's. Just imagine the parodies; Fantasy Island, Sanford & Son, The Love Boat, The Donny and Marie Show, Barney Miller
, etc. It would be hilarious! Also, the soundtrack would have so much potential. Arena rock, punk, disco, funk, r&b, etc. the list goes on. Think about, the atmosphere would be awesome(oh god, I used awesome again).