Realistically what fire sale prices will we see for S4 SS models now?

[Kendo]

Usually stores like B&H cut their older inventory by a decent amount, especially the older model stainless steel Apple Watches. If a SS4 retails for $750 now, can we expect them to sell for as low as $450 based on historical prices when the SS5 hits? I remember link bracelet models were pennies on the dollar for the Series 2 models after the Series 3 came out.