Over 8 million customers and counting seem to think otherwise. Even if the handheld market is much smaller than the the market for mobile games and it's shrinking, it won't disappear completely. The market for motorbikes is also much smaller than the market for cars, but nobody is suggesting to ditch the production of motorbikes completely or only let 1 manufacturer produce them.

Sure Sony would be much happier if the Vita sales were as good as the PSP sales the generation before. And Nintendo would be much happier if they could reach DS sales with the 3DS. But if they manage to make a profit with their systems even in a smaller scale, they should be fine and don't have to precipitously end the production of that devices. 

It was the PSP part 2.

Not even close.  Sony wishes Vita sold half as well as PSP.

I'm pretty sure 4 million Vita owners had sold their Vita's when it had reach 6 million.

So I would say its something more like 4 million costumers, since the rest of them sold & traded their Vita's for 3DS or cash from retailers.

Well, I would expect just this kind of comment without an iota of proof based on your sig.

So it's sold out 

Ask any GameStop employee.

Ive seen a lot of people do it while waiting in line.