Wasn't the GameShark something game developers didn't want in the first place?
None of the major developers ever liked the GameShark, there was just nothing they could do about it, since it wasn't made illegally and didn't do anything that was technically illegal.
There are no GameSharks for modern systems because such a device would basically have to crack the system software to make such alterations (whereas older system GameSharks pretty much just altered a line or two of game code), which is against the Terms-Of-Service. It could get people banned from Online services at best and could be potentially illegal at worst.
OrangeWizard posted... From: silly_sausage | #007 Who doesn't love male gentiles in their mouth? From: jakestar0306 | #009 So disapproving of a stage based entirely around something Sony didn't like that has a 0% chance of happening makes me gay? What are you, ten years old? Having male gentiles in your mouth does not make you gay, it makes you a cannibalistic Jewish radical.