I'm still sitting on my points as well, but I'm really tempted to cash in for stamps to sell right now. Previously I did consider trading for them the next year and hoping that they will increase in price by then, but I am also wondering if it would be easy selling off at a higher price point by then.
I suppose many players who are still playing neopets should already understand the value of stamps, and the ones who want them probably can get them themselves from the cup and/or have already gotten them at their current lowest price point instead of waiting for another year to buy them. So I am quite skeptical that it would be easy to sell them off that easily next year, and realistically that is going to take a while. Not to mention that I am very sure many players are like me, sitting on their points and waiting to trade for the stamps (or other valuable items) to sell for the next year.
But I am not some TP baron who understands how all these is going to work, so I could be wrong.