That's nonsense, there's zero chance that the Vita is going away anytime soon.
The 3DS also went through a rough opening stretch but things are starting to look up compared to just ten or eleven months ago. There's several major releases now available with several in the pipeline and it's starting to build some significant momentum.
I see no reason why in a year or so that the Vita won't be enjoying a similar position of excitement and growth at the same point in its lifecycle. They both got off to unfortunate slow starts, but it's foolish to be predicting the imminent demise of something that is still a fair ways away from even celebrating its first birthday anywhere in the world (And 1/3 of a year away in the United States).