Sony should seriously consider discontinuing the Vita if sales don't improve for it by the end of this year. The money could be shifted to the PS4 which has a much better chance of making money for Sony.
What money?
Sony launched the Vita at basically a break even price, and that was including R&D subsidization, which is in the past. On a per unit basis they're likely turning a small profit on Vita hardware.
On the software side they have a lost cost port pipeline from PS3 to Vita, so cross play games cost very little extra, likely far less in cost than they make up in sales. The Vita exclusives are almost all being developed by a teams too small/not proven enough to be given an eight figure PS4 budget.
Sony at this point is best served treating the Vita as a slow burn a la Gamecube, which Nintendo made good money on despite it's lack of market penetration. They can keep making first party titles from their "B tier" first parties where a six to seven figure budget is a reasonable risk.
This is how companies like XSEED and Aksys survive, porting games to the U.S. with the knowledge that 50K sales is a "success". Sony has a far easier time doing this since as the first party they don't have any royalties to pay and therefore higher profit margins on a per unit basis.
Consider Uncharted: Golden Abyss. It had moved north of 500K units as of June 2012, when it was still at pretty much full retail MSRP of $49.99. Sony's per unit take on that can be safely estimated in the $35 range. So 500K * $35 per = $17.5M in revenue, for a game that likely cost nowhere near that to make.
Or Hotshots Golf, which moved over 200K units at it's original MSRP of $40, with about a safe estimate of a $25 margin, resulting in $5M in revenue, probably right around the unit's break even cost.
These numbers (From Play Magazine circa June 2012) are not confirmed to include digital distro either, and likely don't since that would only be gathered from Sony who hasn't released sales figures for these games. On digital distro Sony's take on a per game sale skyrockets to nearly the full sale price ($45 for Uncharted, $35 for Hot Shots, before any sales and price cuts).
This model even works for 3rd parties, as Ubisoft (despite not giving real numbers) has stated they've been quite pleased with AC3:Liberation's sales on the Vita. Keeping costs more in line with what PS2 titles cost and avoiding the current generation skyrocketing of development cost is a recipe for success on Vita.
The Vita has a very workable profit model for Sony to work with as it currently stands. The only reason they'll have to end it prematurely is if they deliver a more successful portable device that demands the fabrication lines currently committed to Vita. The new Xperia line might do just that, but until they do the Vita is a worthwhile place holder that keeps factories open, developers working, and a small subset of consumers happy, not to mention generation a strong inroad to the handheld gaming market thanks to being Playstation Mobile compatible.