There probably is an element of this in my strange game collection habits as I often find buying them more fun than actually playing them but then that might also be related to my lack of time as I often browse sites like this for 10-20 minutes but find it too much work to sit down and play for the required 2+ hours on most games, at least on adventure games I could usually acomplish something in 20 minutes and didn't feel like I had to carry on playing.
I'm also not sure I agree that the adventure game is dead, just have a browse on justadventure.com and there are plenty of interesting looking titles the genre is just not as mainstream as it once was .
also go have a look at '
http://www.dott2.de/ ' there are plenty of people still interested in those old games who would love some more to be produced just at present the markets are pouring all the money into more clones of fps & stratergy games which also for me just can't keep my interest as the adventure games do