Iron Curtain falling in the early 90's definitely hurt the Soviet and Czechoslovakian programs. I always had this ESPN show that followed a few players going back to Russia in 1995. The Kasparaitis segment showed how bad some of their facilities had gotten.
I wish I could remember the source, but I recall reading something about the Swedes losing a lot of top young athletes to soccer in the 70/80's that could have been the draft eligible guys in the 90's. The 1994 Olympic Gold winning club helped reinvigorate things and that was a reason why they had a resurgence of guys born into that wave.
With the US, I think a lot of people credited the 1980 Miracle on Ice club with boosting interest in hockey. But that didn't cause a bump with draft prospects until the late 90's / early 00's.
I have no idea if there was a cause but even Canada wasn't producing as many high end forwards during some of the 90's drafts.