Games have only gained from being multiplyer games are popular.
Wrong, again, hollow, weak-written, badly performing, horrific FPSs are now more of a norm then well written RPGs. MMORPGs have never been well written because to do so would require an unimaginable budget, something EA/Bioware may change in 15 days but that budget is atleast $150 Million, making it the most expensive game made to date. While Bethesda maybe one of the few companies with a big enough budget, they aren't going into an area that they know they can't handle.
Being able to add a real human being to games makes it much more immersive than just a non reactive NPC.
my idea of immersive is more then having 13 year olds screaming down microphones because they're horrible at games and idiotic trolls spaming chat logs with swears, In fact those things make the game notably LESS immersive.
Real life is random not scripted.
We don't actually know that it isn't, it could be that everything in this universe is already per-determined, unless you know exactly how this universe was created?
Plus this is on mechanic or aspect that games can use that other mediums of entertainment cannot offer.
Boardgames can offer this aspect... it doesn't make them good. Being a good board game makes a board game good, there have been so many bad ones on the other hand. There have also been ones that are complicated and so only a certain aspect of players enjoy them, like Go or Dungeons and Dragons.
There is a large portion of gamers who feel alienated from games when they do not include multiplayer.
Of course the main audience of Skyrim is Bethesda's audience which would feel alienated if it DID include multi-player, let's not be Nintendo or Blizzard and trade in a long term audience for the quick cash of pleasing the casual games who have no real loyalty and move between brands/franchises quicker then then strippers in a strip bar move between men. Nintendo should learn from Blizzard, now Blizzard sees the writing on the wall with WoW it's appealing back to it's old audience, Starcraft II... Diablo 3... what will be next Warcraft 4?
Skyrim as an open world game completely benefits from multiplayer just like dark souls, red dead, gta, saints row
Again no, it wouldn't It'd destroy literally the entire thing that TES games are all about, you can't take away the major part of a game and call that benefic... oh the magic creation system... attributes and... yeah... now people surprisingly want the magic creation system back and are missing the attributes. Being a single player, being THE ONE, that's what the series is about, making it multi-player ENTIRELY destroys that.