many people don't understand the many pluses of home mining, but as time goes on and the network grows we will get squeezed out due to power limits.
this is true only if difficulty growth continues to outpace Bitcoin price. If the Bitcoin priced moved to $750 (+100%) in the short-term while difficulty only grows +50% then there will be two effects:
1) mining at higher power draws or with >1w/GH equipment will immediately be profitable to run for most people, even if electricity is ~$0.28/kwh or more
2) miner prices are cheaper because what now costs 1BTC ($375) to build and ship will only be 0.5BTC or less
granted - I expect that almost all but hobby mining will be centralized very soon, wherever electricity is cheap or cool air is abundant. That's just a natural outcome as Bitcoin becomes a competitive technology and companies like Bitfury intend to operate over 100MW of equipment