unless you're talking about a shop in middle Africa or even Outback, China that proposes to utilise such a system in a mesh network to bring remote communities one step closer to being Facebook zombies.
Hell, for that matter - how much processing power do you need to run a DHCP router? Or a DVR? Or a home automation system? Something as simple as an automatic garage door opener? An RFID reader?
There's a BUNCH of uses for low power/small iron that Big Iron would be utterly WASTED on. The aforementioned is not, by any means, exhaustive.
Keep in mind that modern Android phones have quad-core processors and will continue to grow in performance.
You should never bet against anything in science at odds of more than about 10^12 to 1. -- Ernest Rutherford