Not being rude here but your point is straw man isn't it? Yeah it would take away from them being able to do something else. However every time they work on adding something new to the game it takes away from something else.
I fail to see how this is a straw man, I'm not attempting to manipulate or skew Superior Defender's argument. In fact I agree with his argument - it isn't
impossible to add multiplayer.
Semantics aside, you are correct that any work in one area will preclude work in another. If Bethesda hadn't wanted VATS the programmers could have implemented something else, if the designers put in fewer quests they could have made the ones they already had longer/deeper, or perhaps added more locals, etc. I'm sure there were plenty of ideas the developers were excited about that were eventually cut due to resource constraints.
Multiplayer is a particularly large and resource-intensive feature. I merely suggest that the people who want Bethesda to include it consider that this would draw considerable resources away from other aspects of the game developement. Even ignoring that they might have to sacrifice some features in order to have the needed resources it would complicate making the scripting system, greatly complicate VATS, make it difficult to streamlining and clean up the engine, and require a lot of additional QA.
Overall it could work and I think it could be done well and no I don't think it would cost $100.00 per game either considering how much profit Bethesda makes off their games anyway I found that remark to be extremely ridiculous to say the least. The only problem I see with it is Bethesda not doing it well. They've only done multiplayer on one game before that I'm aware of and that was years ago. Also fallout 3 didn't have the greatest shooter elements either so my biggest thing is not if it could be done or if it would take away from something else it's would multiplayer be done right?
Chances are Bethesda (or Obsidian) would need many more programers and testers, which would lower the number of designers and artists. Some people are OK with having a smaller game in order to gain features like MP. While I am not part of this camp I certainly don't begrudge someone their opinion. All I did was point out that adding MP requires sacrifices, I don't think you can simply ask for everything Fallout 3 had
plus MP.
I enjoy multiplayer games, but I'd much rather play a game the focuses on being multiplayer or singleplayer than a game that tries to do both. Most of the latter end up feeling weak on at least one side, and often both. There are exceptions, including a number of FPSs and RTSs, but they tend to be very focused games to begin with.