Kieron Gillen has interviewed Stardocks Brad Wardell and it's well worth reading. The part about RPGs:
My accentuation. Let's hope that the right people read this and start thinking. Listen to this man! I'd love to play a traditional, turn-based RPG by Stardock even if I doubt that it would be heavy on c&c.What game would you make if you had limitless time?
Wardell: We'd be doing an RPG right now. A Baldur's Gate style RPG or an Ultima V style RPG. I'm not talking about Oblivion, but a traditional, top-down party sort of game. Because I don't see them - Neverwinter Nights has that, but there hasn't been that many. I don't understand it, because I think there's still a market.
Ultimately, it comes down to how much it'll cost you to make the game and how many do you think you can realistically sell.
If you made a Baldur's Gate with good graphics and story, that's well produced.... well, I don't think it'll be very hard to sell 200-300,000 units worldwide. If a turn-based strategy game could do that, certainly a well produced RPG could.
How much money that translates to? Six to eight million dollars. And it just becomes a matter of "Can I produce a game with that?" And unfortunately, a lot of studios can't any more.