80% of people who own or owned this game don't play it anymore and have moved on completely. It's us 20% which still actually give a damn about it. From the standpoint of a game-maker, there's little to no revenue. If they were indeed doing it, they would give it loads of publicity, and do developers diaries, and things of the like. Which they haven't, so yeah..
Exactly. Sure a new expansion would be neat, but would never be done.
But hey, ES benefits from one of the best modding communities, so it balances out.