Everything has its heyday, and games are no exception.
It's difficult for me to make any sort of intelligent statements about this since I didn't know there was anything beyond Monopoly and Axis & Allies until June of 2004. Since then I have been trying my darnedest to play catch up.
I am still new enough to be surprised by innovative ideas, even in older games, but I also feel that I have sampled quite a wide variety of games.
In the past 6 months, I have seen some very interesting new games: Caylus, Punct, Antike, Triumvirats, Mesopotamia, Kaivai, Hacienda, Siena, Tempus, Byzantium, to name a few. All got my attention. A few will get my money.
But as I look at my game ratings, I can't help but think that, for now, my favorite games are likely to remain the "older" ones. Are they simply the classics? Is it just that there are more older games--obviously--than newer games? Was 2005 a slump year? Are we still climbing the hump of the board game curve?
I'd like to think that there are many great years of board game production ahead. Although I already have enough games to last a lifetime, I can't bear the thought of stagnation. I always need to have a "next order" pending--something to look forward to.