I don't think it's a horrible idea on current inventory. With current coupon price on S7's it almost makes me want to see current gen and buy back in after next gen, and after we see next gen difficulty jumps at least at first.
Double I ever sell all my asics, but tempting as I see S7 price pushing down current gen in value as we speak.
So maybe Bitmain and other manufacturers are already mining with the new miners and they are keen to get rid of the old S7 as well.
BW confirmed today large customers have been mining with their new miners and public availability is June. That would explain the increase in difficulty over the past few months.
We don't really have numbers to make it prove its them though. The first machines did not even get close to spec. So we don't know what the current spec of gear is, and they use a LOT internally.
Likely we will know more in June if they keep that date. But I want to see evidence of them hitting targets on efficiency or it really is not as big as deal as we thought.