A lot of controversy has been brewing since the announcement of the Sony PSP Go. Some of it valid, most of it skepticism and retailer anguish, but there's some truth to both sides. It wasn't an easy decision but something had to be done. The UMD is for all intents and purposes dead, defeated, vanquished, extinct, inanimate, no longer alive. The fact of the matter is Sony dragged this out a bit longer than you can let things run, and so now everyone is appalled by an internally intelligent decision, however unsacrificing it may be. The fact of the matter is no one is really asking if this decision is going to debilitate the undermining issue the PSP had/has. For those of you asking "What one thing was it?" there's really more to it than that.