Gaming on the PC is steady. Best Buy still gets in new PC adventures all the time - mainly from City Interactive and Her Interactive at 19.95 each. In fact, I have not paid more than $19.95 for a PC adventure game in 4 years.
I tore myself away from my DSi XL (TONS of Adventure games and new ones coming out all the time) to play Cards of Destiny on the PC. I must say, for a PC adventure - it is rather fun. Sure, the script is lacking and the story is been there done that - but the graphics are fabulous and it is very bug-free.
As long as City Interactive and Her Interactive keep putting them out - we are in good shape. Gray Matter later this year should be a real treat.