Well you can speculate on the fact that it won't drop any more, but tf2 trading is generally the buyers market. You might still have one for sale a year after it stopped dropping, but noone can guarantee that there will be demand for it just because there isn't that many on the market any more. There is a possibility that most people who want to get one will own one by then you know, and tf2 doesn't get new players any more who would pay a lot for it just because they weren't around earlier.