While from the business end I certainly understand the desire to favor newer programming over the old classics, I can't help but take note at what's disappeared from the schedule (in a few cases appeared and disappeared both) since June 2008:
From June 2008 to June 2009, the following shows have or will have left GSN (recalled through the archiving of all those handy schedule PDFs):
Love Connection
Blockbusters (Cullen)
Blockbusters (Rafferty) (appeared *and* disappeared)
Tic Tac Dough
Let's Make a Deal (1970s version)
Let's Make a Deal (1980s version) (appeared *and* disappeared)
Press Your Luck
Card Sharks (Perry)
Card Sharks (Rafferty)
What's My Line (CBS)
I've Got a Secret (CBS)
To Tell the Truth (Collyer)
To Tell the Truth (O'Hurley)
Now You See It
Trivia Trap
Child's Play
Beat the Clock (Hall)
Body Language
Double Dare (Trebek)
Russian Roulette
Friend or Foe
That's the Question (appeared *and* disappeared)
Camouflage
Twenty One
Greed
Weakest Link (NBC)
Weakest Link (Syndicated)
Dog Eat Dog
The Name's the Same (entire run)
Family Feud (Ray Combs)
Every series listed above aired on the GSN regular schedule at some point in the last year but is gone now. The overwhelming majority were on the June 2008 schedule, while a few (Rafferty BB, TTQ, 80s LMAD) both came *and* went. And the disappearances list doesn't even include titles that were leased but not aired (three different versions of To Tell the Truth (70s, 80, 90), Tattletales, etc.
-------------
Meanwhile, from June 2008 to June 2009 the following shows have been added to the schedule:
Family Feud (Combs Syndicated)
$25,000 Pyramid
$100,000 Pyramid
Family Feud (Dawson Syndicated)
Match Game PM
Password (60s Daytime Color)
Bergeron HS
Catch 21,
Newlywed Game 09
Millionaire (Syndicated)
Deal or No Deal (NBC)
1 vs. 100
Rich List/Money List
20Q
To *me*, reflective of my own personal tastes, the schedule has been absolutely ripped apart - a couple of shows at a time - over the last year. Yes, TV networks evolve and change. It's one of the characteristics of the industry. While it does save a considerable amount of DVR and opens up the television to other programs when turned on, it's not entirely pleasant to see what's happened with the network in the last year.