Thieves (who are, in most cases, just trolls because it seems it's better to steal from NPC's than from other players in "Noob California Republic") would get the best part out of this... However Lordus's idea isn't really bad because it kinda gives you a reason to take chances.
But anyway, let's say this gets implemented, will the game really change? I think we'll have the next situation:
-Player A wants to craft, travels to NCR
-Player B is a known thief, so A knows he has to avoid B
-A runs to the workbench and craft his stuff as fast as possible
-Player C comes to NCR to craft, he is a friend of A so he says hi
-A just answers "hi" and runs away because he doesn't want to get stolen
Nothing is added, no real interaction.