I don't like to repeat my self again, but basically it's to me like that :
- Publishers are interested in money, not in gamers
- therefore they have a tendency to sell what sells
- and that is Action-RPGs
That's all.
And that's in my opinion the reason why we won't see games like Wizardry or PS:T for a looong time now.
(Apart from the fact that there are too much implementations of the (A)D&D system out there for my very own taste. But that's a personal thing. I'd rather prefer DSA.)
