Funny, I haven't bought a Steamworks game knowingly in almost 2 years.
My recent Origin purchases should not count, as upon installation I was prompted to enter a Steamworks key, much to my surprise and disgust. You see half of Origins catalog are actual Steamworks games with no indication of the Steamworks requirement on the product page. =/
Steamworks has been integrated into almost all AAA titles recently released and in the foreseeable future by almost all publishers. Its client has become a bloated piece of software consuming several hundred megabytes of system RAM and slow to respond.
Steam was once a simple server browser that one needed for Counter-Strike, Team Fortress Classic and Half-Life. PC gamers did not need it to install and play a game by a different publisher. Steamworks now it is being forced down our throats by publishers, forced into activation on its service, forced to come between the user and his/her purchased subscribed game, forced to belong to a subscription service and to accept its user agreement or be forcefully locked out of previously purchased subscribed games on its service.