Too much other puzzle-server now, no new puzzle-maps by Dasole, that's some reasons.
Very much agreed. Same stuff on too many servers. No addition, that bores.
My opinion is the best i think 
Half life was released on 31 Oktober 1998 and was sold to 9.3 Million people.
Half life 2 was released on 16 November 2004 and was sold to 6.5 Million people
Half life 2 Deathmatch was released as a surprice from Valve on 30. November 2004
So i think Half life 2 deathmatch is now around 5.5 years old so what do you guys expect this game gonna run out of player. thats why all server lose people. This Game gets boring with the time so they gonna play other games.
I totally agree with you, but I want to 1 thing to it. People grow older, get lives and put the keyboard cable into the trees. They move on.
Also People are desperatly waiting for ep3 or hl3.
Same as me waiting for d3 because d2lod is overplayed.
Mmh, I think everybody of the Community should join from time to time on the Funhouse. If people
see some Players on it they wanna come too... 
I've noticed a steadely rise of people activity on the servers. Since S3 has been closed there has been a noticable uprising of people on either S1 or S2. They usually leave after 20:00, but the server usually keeps filled with at least 7 peopz till late into the night.
Theres more animo for rp servs and less for puzzle. If someone can come up with something new, well maybe that person has the monopoly in hands.
I've been noticing there were 15+ peopz on the puzzlehouse the past 2-3 days.