I can't see a reason for Dave to do a heel-face-turn and betray the trio. Not only that, but he'd make for a poor antagonist. He isn't very "action-like" in his appearances compared to Steve. I think the only times he shoots a gun is in "Monkey Business" and "The Wrap Up".
I gotta agree with that. I only wrote it up if and only if they asked me to make him an antagonist against my will. I do feel though that The Third Way was pretty piss poor in a final mission.
If Rockstar holds true to the idea of single player DLC, I can imagine Dave's role being expanded on, but he still seems unlikely to turn on people. If he had that mindset, he would've turned on Steve or Devin when he had the chance.
Yeah. Besides, he gained enough trust with Michael and keeping him safe for so many years. If Townley was exposed, the government could receive a major court case which would result many going to life in prison.
I think the government's pretty incompetent for the most part, seeing as right after the trio get away after the big score, they don't bother with an investigation or forensics or anything like that. Not only that, but considering the idea of Michael going into witness protection with all the money he made from robbing banks and not getting any slaps on the wrist, it seems kinda unlikely to happen in reality..
But I get what you mean, though, it could happen with the leeway in the GTA universe regarding law and justice.