Point is that there are numerous disadvantages to using these systems in real life that would never happen in a game, that would just make it over the top convenient. One of my greatest worries is that of public gameplay. We've already seen that many public servers play at (imho) horribly easy settings. When these enable 2nd monitor map combined with extended map info, crosshairs, and 3rd person (they will, trust me) - the advantages between those with and without 2nd screen will become humongous. We don't need an even worse public gaming scene. Personally I've given up completely, and I'll rather play solo on own (closed for public) server than join up on public. It shouldn't have to be like that.
And I don't get this idea about "oh it's only a server setting". We only run coops on our server, so difficulty settings isn't much of an issue (all same except AI skill). How about those running different game modes requiring different settings? If someone hosts and plays warfare (the way it was meant to, with players as squad leaders), then extended map info and 3rd person might make sense. So what happens when switch to a PvP or coop map? You'd have to rely on using different settings (so forget about having same bit different AI skills) or different server profiles where you have to restart the server.
I think TAKOH (preview) did it fairly well. Hold GPS to get a fullscreen non interactive but semitransparent overlay, whereas toggle GPS gives you the old one. I'm guessing it still didn't show extended map info (since that is mostly for commanding purposes, where you need to have an interactive version like the normal map anyway). And the interactive map still had the limitations it does today, including that of slowing down when used. If anything, I'd like the option to turn off "show own position" on the GPS instead for those of us who enjoy fighting "old style"

I wouldn't mind FarCry2 style map either, as this "hold" version - it would simulate a handheld fairly well, without going over the top wrt possible resolution.