Imagine asics for everything. I mean everything, like implementing a javascript engine directly. The energy efficiency could go up 2-3 orders of magnitude (looking at the difference in bitcoin mining between gpus and asics).

Old gaming consoles had cartridges (with memory); I can imagine a future in which complex software is transported in the same manner, except cartridges contain specialized asics. Or perhaps a step forward - a chip making device in every home, an equivalent of sorts of burning music to cd.