Don't know about anyone else, but if I'm trying to avoid players, sure I look at the scanner for hollow blips behind me, but if I'm actively looking for players to warrant scan or fight with then I'm looking at the comms tab, and then switching to the contacts panel so the only difference it would make is that it would probably make me scan an npc or two until I got to the player I was looking for, that's less likely to see me coming.
Unless you do away with comms and the CMDR tag it'll make no difference or possibly make it worse for peaceful players, and if you're going to do away with comms and make it basically "pretend to be an NPC mode" then we already have a mode for that, it's solo.
Lets say everyone looks like an npc, so let's push the idea along a bit, let's say you're bounty hunting in a res, you come across a deadly ranked FDL or FAS, rub your hands together and think, "yes, nice bounty, I'll have that", open fire, it's a player that's much better than you and you die,
I can take a deadly or even elite ranked npc FDL or FAS in pretty much any ship I like, players, (regardless of rank) not a chance, some I can beat, lots I can't, and I have to have the right loadout, (I'm really not an expert at PVP).
Maybe that would add some challenge to the game for players that are a way on in the game, but it would make it darn hard to start out, and once you're a way on in the game you can find a challenge easy enough if you want one, just go to eravate, post on here saying you're going to kill noobs (don't kill noobs though, that's not nice) and a whole bunch of PVPers will give you as much of a challenge as you could ever need.