Its tough to say though. A really good laptop 4 years ago was 3000-4000. We've seen a significant decrease in PC prices, largely due to competition and a weak seller's market (think how weak the stock market/consumer economy were for 01, 02 and 03).
I'd say it can go one of two ways. The way Ender said, in which the price will stay relatively the same and only go up a few hundred relative to inflation.
But it could go another way - that is the price could drop significantly - especially if we see more and more companies like those selling the "no brand" computers popping up and actually grabbing a market share. Other factors that could drop the price are more competition in the chip market, as well is in the GPU and chasis, LCD, and HD markets.
Right now its very easy to find quality no-name RAM. But it is much more difficult to find say a Processor, GPU, chasis, or HD.
So the answer is;