The vineyard with the cropduster:
Trailer screens:
Note it is in a very hilly/mountain area shown in the first screen (far left under the plane). The second shot shows rock formations among the plants.
And now real life vineyards in Malibu ~20 miles from Santa Monica (where the pier with the ferris wheel/rollercoaster/etc is):
Note that it's in a hilly area and even has a rock formation. There are a number of vineyards in the area nestled down in the valleys of the Santa Monica Mountains National Recreation Area so I'm going with "Malibu is in the game".
I think they should get it as close to real life as possible. I don't understand why people want a game to be less realistic. It doesn't make any sense to me.
There's this thing called ratings. Rockstar's titles get rated "Mature" or "18+" with the guns/drugs/sexual content/etc as it is. Blowing people in half would probably throw a game like GTA into the "Adults Only" category and/or banned completely in some countries. Sales would take a nosedive even with the controversy created.
As for replay value, it would be a novelty like hookers. You'd do it a few times and get bored. The novelty would wear off.
On top of that it would be a useless mechanic to code anyway in my opinion.
With the planes in there has to be at least two airports, otherwise whats the point?
What I'm hoping for is a good medium-sized city on the other side of the map from Los Santos. Something like San Diego would be perfect.