Okay, let's look at this from a different angle.
If we can agree that PSVita sales so far are poor -- and I'm assuming we can agree on that -- then there has to be a reason for that. Why is it selling poorly?
Is it the price? I don't think that's reasonable: we know the system is already being sold at a loss, and it seems unreasonable to ask that suggest that any system be sold at an even greater loss before we agree that the price is acceptable.
So is it the hardware? Sony could have reduced hardware capabilities (and in doing so, reduced the price range). This works for Nintendo. However, there are two problems; the increased hardware power is one of Vita's unique capabilities to distinguish it from the 3DS, and most of Sony's major titles are "cinematic" or highly realistic in style (Uncharted, Gran Turismo, God of War), which are the types of games which benefit particularly from raw technical power. Lastly, even if those other hurdles were gone, I think most of GAF does not like this solution.
Is it the network functionality? From what I've seen, it has the best network functionality of a portable system ever. But even if it didn't, this doesn't matter a great deal in Japan.
So what do you blame? Because the most logical culprit, to me, are the games. If you've got another explanation, though, please elaborate.