Psp IMO is still a good handheld, with a great library of game,s and still exploitable, however, pspvita lack of interest and games.Those systems got popular in a short burst of time and died off. I mean the: 360, Wii, PS3, PS2, DS, WiiU, and more. These systems are fully exploitable or are being worked on to be fully exploitable.
360 is great a RGH and also has LT3.
Wii has Homebrew channel and full IOS access.
3DS is stuck atm with 10.3 and lower.
PS3 has custom firmwares, but sadly only till 3.55 [<------ This worries me, because, we dont know for sure, if the wii u will stuck on a firmware specific hack.]
Ps2 HDD Loader
DS Cheap R4 Everywhere
PSP Can still be exploited
But the thing is again, people who want a KODY/XBMC cheap setup might go for a small android tv setup, instead of waiting for the Wii U in order to port linux in order to port the Kodi distro.