Not having played Morrowind (but played Daggerfall many, many years ago, which is a precursor to it), but understanding the basic engine/approach behind it, I feel compelled to mention that it has very little affect upon the overall RPG market, especially the "hard-core" RPG market (assuming we're all talking about CRPGs, and not paper/pen). In fact, I consider it more of a yawn. It certainly didn't have the effect that the original Baldur's Gate (and all the other ones that leveraged its engine) had.

I've not played Dark Alliance, but that's only because it's a console game, and I only do PC games (where both Baldur's Gate and Baldur's Gate II were fantastic games).

Morrowind's main claim to fame is its size and non-linearity. However, its engine prevents it from being taken seriously by many hard-core RPGers (at least, those that I know).

I expect that Dark Alliance didn't turn out so well because it was the offshoot of a PC game that was being leveraged into consoles (which, regardless of which way you go, doesn't tend to work well, for various reasons).

Dan