you can actually be lucky and sella bove the market price with new equipments, there are cases of this happened already in the mining section
because there is a high demand for new asic
You yourself said that s5 is nothing new, but you can still sell it for the same price which you bought it at when it was top notch and ahead of the pack. And now you talk about new devices only. Who is going to buy the old equipment that will be pretty much useless after the halving?