Skyrims been subject to alot of blind praise, terms like "perfect" and "best game ever" are tossed around casually. Most of the reviews and awards being given to it tend to be heavily one sided, evidence that goes as deep as number of copies sold is used which has too many variables to be used as evidence. Yes theres alot of "hard" critisms here but if anything its more weighted on the other side. As far as arguements for VI will now get a bigger budget due to sales now meaning a better game... A) Skyrim had both a longer development time (ie. the story was more or less set around 5 years ago) and a far greater budget then oblivion but is lacking in many of it's qualities, maybe oblivion was a worse game but you can't seriously argue that the guild quest lines are better in anyway here, both character reaction, depth of journey and length have all suffered.

If no one said boo about certain features let alone gave "hard critism", feedback and ideas for improvement then why would they use more money to change something that is percieved as perfect?
I am neither a hardcoe (skill, difficulty or number of games played a year) gamer, nor do I see myself as a casual (in the sense it's tossed about today). Yet I have many complaints regarding the basic gameplay features of this game.
No, I am not a games developer, shocking I know that me, one person is not an entire studio, as large as I am I don't think they'd all fit inside of me, seriously though I may not be a games developer but I do have something called common sense, ie. if a programmer had some they'd have used the same feature to check the players inventory for the dragon stone for all the items you can pick up in this FREE ROAM game. As a designer to I know that it's hard to get prespective on something so close to you, feedback can be a very positive thing too, not that they could listen to everyone but they could listen to the great number that have bothered to come here to say that guild quest lines are shabby (and that is unlikely to be everyone that agrees, shocking I know many just wouldn't bother to raise the point) in doing so they'll likely offend no one. Also of all the repeatable quests marriage should have been one if your partner died, but then again with so many other areas lacking I'd rather see other features work on instead of the 10 min shallow addition to the game. But what the hell, give me $50 million and I'll happily go out and hire people to spend the next six years to make a open world RPG, although I'm not responsible if I take most of the money myself doing little and just spout off stuff that doesn't exist in the game (PM syndrome), I will say to you now that the sales won't be as high as skyrims even if it was quantifiable better in everyway, the mere fact bethesda has existed for decades has contributed to that at least in some small part.
On a final note, let me leave you with this, Zynga last year sales made around $1 Billion, does that make it the best game developer in existance, the rightful future of gaming even? I guess in some sense it is with hundreds of hours being poured into the games which must be a testiment to the quality of its design and depth it has.