When I see the PSP Go, I think Dell Adamo. Maybe they do make meager profits, but they don't do anything to make me believe they are on track to compete with Apple or Nintendo.
Remember the mini-disc? It was expensive, and maybe it even made a profit for Sony. It might have even been ahead of its time. The problem is nobody wanted it. And while Sony spent time continuing to dick around with their mini-discs, Apple invented the iPod. This is how a product can make money and lose money.
Anyone can guess. It takes no effort to throw out lots of predictions and have some of them be correct. You are not and wiser or better for having your guesses be right. Even a blind man can hit the bullseye.