Their big problem with Vita IMO is what exactly are they going to sell and do they believe in their product? they are going to have to confidently tell the world "awesome games here" and hope that's enough, because they have little else to offer.
I think they do believe in Vita based on their sunken and on-going investments. Whatever on Vita today is actually quite impressive. I am having lot's of fun with the little thing. You can check out the LBP GAF thread for some ideas, but there are other interesting, small contents here and there. And I do now carry Vita where ever I go, together with the iPhone 4S.
From outside, I suspect the key problem (if it's only one) is Sony top execs' management approach. Perhaps they are tied down by strict budget these days, or perhaps they do not want to take attention from the money-making PS3 and PSP, or perhaps they are tied up by other secret projects, the thing is they don't seem to have time to QA their staff's Vita marketing output.
They can't package and communicate the values. Their marketing people seem to be very numbers-oriented. The decisions are made solely based on a baseline unit numbers, and from Sony's hardware perspective. There is absolutely no attempt to simplify and deliver the "Vita" idea to perform even better. Once the sales tracks their conversative baseline, they sit back. I am not sure if they have buffers in that baseline numbers too. ^_^
What their marketing people do a lot are events, sponsorships and Internet marketing. But those are very tactical. Without a guiding vision for Vita, they tend to be fire-and-forget.
They don't necessarily have to drop price (Actually, they should not. Not yet). But there are many things they could do cheaply by just being able to see things from our perspectives instead of following that graph. 8^d Many times, they did things without much thoughts, that came out sabotaging Vita's image.
Naturally these are seen from the outside, I have no idea if any of these are true. But I don't think I'm alone here.