You are complaining about the job the development team did on Skyrim coding. You whine about the prospect of them making an MMO. You sound like a moron as a result because those coders who you blame for leaving you an underground hole in the world aren't working on the MMO. You try and cover your mistake by saying the publishers are the same but that isn't working. Sorry.
The developers are different teams, they are going to do things drastically different. It is already a massively different game than anything Bethesda has done with TES. Most purists are either annoyed the game doesn't resemble the TES style enough or just thankful that the game ISN'T being made by Bethesda so they can expect no delays on TES6 as a result. Bethesda doesn't have input beyond a conference call here and there in relation to lore.
And what I was saying is that the game performs well on good hardware that gets its updates. The 360 isn't good hardware and you probably are missing some patches as a result of simply being on a console. I've never seen holes like you have shown and I play an extremely modded game full of opportunity for data clashing, save corruption and other inconsistencies. I know for a fact you are playing a subpar build in fact because the Xbox doesn't even have all the patches Bethesda has put out in relation to terrain and textures as the console can't handle it. The game was heavily updated post release with PC improvements. This isn't the only PC game to under-perform on xbox360 either. Minecraft let's plays filmed on the 360 are hilarious. That is what your hole in the world reminds me of, minecraft struggling with the gameworld. Maybe next gen consoles will be able to step up.
And yes, the servers are separated.