A TH/s miner pretty well uses up an entire 15A circuit breaker in your home.
How many spare 15A breakers do you think there are in a home with a 100A service?
Do you seriously think someone is going to spend $20k on ASIC hardware, and balk at adding a breaker panel?
Perhaps amateur mining will cease to grow (although it will always exist). The wiring issues are the least of the problems for large miners.
The only real problem I see with mining is centralization.
Centralization will be the beginning of the gentrification of Bitcoin. Once it is centralized it can be controlled by banks and governments.