Y'all may yawn and hoo and haw but games like Baldur's Gate, Planescape Torment and Icewind Dale owe their ability to be made to Diablo.
I'm sorry, but I have to respectfully disagree with that statement. All of those games you mentioned are D&D licensed games. And D&D licensed games have been made for the PC for years and years..... If anything, the games you mentioned owe their ability to be made to the original Gold Box games from the late 1980s (as well as other well established franchises like Wizardry, Ultima and Might and Magic)... and I would go as far as to say that Diablo owes its ability to be made to them as well...