well the current tredn of the diff is already the case of this, because at this level not even at 0.05 cent will be profitable, if we don't take into account the roi only on the new equipment
and my electricity is very bad and so i stopped mining long time ago
The problem with this becomes were kinda at the last of this generation of miners. And no one knows how long it will last. Will bitfury take months? Who knows for sure.
I think timing on next generation gear could also be a factor. Also what happens to the old gear will be a huge factor. If they find places in world to keep it running, or if some gear like A1's finally start to come offline in big numbers.