I think the low sales are simply due to the the PSV having 20+ games available at launch. So far there hasnt been a an absolutely huge system selling game (UC is popular but not one of the must-haves) and with the huge variety of games, software sales has been split between all the 1st and 3rd party games.
I dont really know how well the PSV will do on launch in the western territories but I dont think it is hugely important as the DS (which picked up speed after a while) and the 3DS (which had a good launch but slowed in the following months) have shown. I really dont think they can do anything else other than more promotion - there is huge support for the PSV, a huge variety of games from 3rd party developers, better online connectivity than any console out there. I think the PSV will slowly pick up in sales as more and more games become available and the features become more well known.
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