On the other hand, ASICs are the top of the line in mining and we're already pushing the limits of chip size and wattage available "at the wall" so without some serious breakthrough we may be at a plateau for a while. Just look at the S7's. They pull almost 1200 watts now on three hash boards. A lot of home walls only allow about 1200-1500 watts per "room" (circuit) so power consumption is just about pegged.
Chips can't get much smaller at least for the next year or two, and I don't see them coming out with a quad fan (heat is a real issue with S7s) 240v industrial miner.

There's just not much money in it because purchasers are limited. Anyway, that's my line of thinking for now. It may change as the wind changes.