Afraid LA will be too small?
Look at True Crime: Streets of LA, the map in that was fucking HUGE (be it there were countless bugs). I have no doubts in the size of the new map.
That and V will have what appears to be a pretty massive countryside. I'm not worried at all map-size wise.
If the body did not die, and the fears borne in the mind just continued to pile up, the world would be nothing more than an eternal prison.