I read an article on a website, for the life of me I cannot remember what the website was, but it was basically about why the hobby of wargaming has had such a demise over the years.
It cited a number of reasons like computer games and consoles, role playing games (warhammer etc) and quite a few others. I certainly do think that computer games and consoles did indeed pull alot of people away from wargaming, and i was one of them, probably due to the lack of opponents I could find.
But one reason this guy gave was that wargames started to become too complex, making it less enjoyable and ultimately ruining gameplay. I must admit, he has a point. There were a number of games that i owned years ago that had huge learning curves, the ones that come to mind are stargate & mechwar '77.
I have just bought mechwar '77 again, assuming that it may have been my young age that may have caused me to not understand or to get "bored" with learning the rules ( and I hope it is), but I do think as game as designers sought new ways and different mechanics for their games to be played, they may have just sacrificed, in some instances, enjoyment for too much realism and depth