So how can I answer? Will I mine at a lose? No.
But I will still mine FOREVER! mwahhhhh
Since I have free electric and already running dozen of boxes, they just chug away in my currently spare room (with the air conditioning there on 24/7 as well) out of sight and out of ear range.

I guess it'll become 'unprofitable' to me if/when bitcoin hits zero. I'll end up stopping when I want my spare room back tho.