I dont know I think it would be fun to be able to open up my own trading post in the middle of the wasteland, or to be able to enter someones base. So what if there are people who would come and just shoot the place up, or people that set up bases as traps to lure people in and rob/kill them. IMO that is all part of fallout and that kind of stuff adds to the fun of the game rather than takes away from it. In addition, there would also be people making bases and trading posts visible for honest trade, pvp, rp or other reasons.
I honestly think that this small change would add a great deal of versatility to the game for trading, pvp and rp purposes. Also if you dont want your base to be visible, there can be an option not to reveal it on the wm.