This program is just an excuse to do another X-Files even though Chris Carter ended the real X-Files. Spotnitz was out of work, that's the reason for the show. It colors my opinion that I didn't care for the TV movies but lovred the NS series. The characters and humor and atmosphere were crucial for me. Kolchak was more important than the supernatural danger of the week. This new thing called "Night Stalker" has no Kolchak. That guy is not him. The character is completely absent, because it's superficial 2005 where no one would ever put a rumpled middle-aged un-model-like loveable loser character in clothing twenty years out of style on TV.
X-Files isn't that influenced by NS, which is evident from how little Spotnitz understands it, at least the series. Carter said it wasn't a direct influence. Watching the Invaders recently, that has to be the most directy influence. The infected bees even came from that show. (locusts)
Dan Curtis did the movies but not the series, so maybe he did have some say. But I'm getting the impression DC wasn't much responsible for what was good about DS, and was sort of confused by the love people have for it.