I don't see any evidence that they're going down in price nor that more are for sale than usual. Ever since I started looking for mine back in 2012, there have been lots with low mileage for sale on ebay. Other vehicles with which I have experience have often gone up in value, then hit a plateau, then up more etc. Some vehicles never go down in price (think Columbo V12 Ferraris, Bizzarinis, Vincent and Brough Superior motorcycles etc). I think that the "new GT" (wish Ford would call it something else) will not cause a price drop in 05-06 cars; it's too different in almost every way. Someone who wants a "modern" supercar will be interested, but anyone who likes "GT 40 styling" and no nanny devices will want an 05-06. Furthermore, the new model demonstrates that Ford is unlikely to EVER produce another with 60s styling. "New" and "old" GTs are not interchangeable, nor are they similar except that both demonstrate what the FoMoCo could do at the time of design.