Why does Rockstar no longer develop any games other than GTA and Red Dead Redemption?

Question

The most recent non-GTA or RDR game they have published is Max Payne 3, and that was all the way back in 2012.

Answer 1

This is because the other games just lack popularity when compared to these.

Answer 2

I wish they would make GTA 6 or even just a new map for GTA 5