They will if developers ask for it though I'm not sure it's going to happen. Sony may double the RAM in a revision. Every version after the original 1000 model had 64MB of RAM so that's a possibility.
Anyway, I think Nintendo was smart to drop the price as low as $170 as opposed to $200. It has nothing to do with Vita. Nintendo's bread and butter has always been publishing games, but they need to sell the hardware first. The lower the price of the box, the more attractive the product. I wouldn't have bought a 3DS even for the free games if the price was $200. I recall saying I'd break and get one at $180 and Nintendo dropped the price even lower. I debated it over a few days, but that hefty price drop sealed the deal.
Vita is in an odd position. Sony hasn't convinced me that I don't already own one. They keep talking about how it can play the same games as PS3. That's a technological boner but I'm not going to buy new hardware to play the same games on a smaller screen. Nintendo may have sweet talked me with free NES/GBA games but the main reason I bought it was for 3DS games. Right now, as far as I'm concerned, I already own a Vita and unless Sony convinces me otherwise, I'm not going to buy another one just so I can play it in the bathroom.