8-4 crew said in a recent podcast it barely had a profile at all in Japan, no real store presence. Don't know how extensive that is, maybe someone like Vinnk can provide more anecdotal evidence.
Yeah, that's another reason why Sony will have to do something soon about Vita.
When Iwata was explaining the 3DS price cut, he said that part of it was due to 3rd-party partners starting to reevaluate their commitment to the platform. But the other part of that comment was that Nintendo's retail partners were also starting to get cold feet about their support for their platform.
So yeah, there's no doubt that 3rd-parties are seriously reevaluating their commitment to Vita as we speak, but the same would be true for retailers as well. There's just no reason to use up prime storefront space for a platform that is routinely sub-10k per week in Japan (and probably approaching something in the neighbourhood of 15k per week in the US).
I could be completely wrong in this but I think that if Sony can, in the next few months, 1) drop the price to no more than $250 for the 3G/ $200 for the wifi out the door (meaning with a decent sized memory card), 2) get PS1 support locked in and 3) actually get their product some visibility in the form of advertising then the sales needle will move in a positive direction.
Dropping the price and advertising would certainly help move things in a positive direction, but honestly, the PS1 support isn't going to do anything. No one (speaking of the general marketplace, not some nerd on gaming sites) is going to buy Vita because of PS1 support. They can already play PS1 games on the PSP, or PS1, or PS2, or PS3, or emulated on a whole host of other devices. PS1 support would make for a nice little addition for those who own the system, but it's presence (or lack thereof) isn't going to move the needle one way or the other.