You do realize if that USB miner mines 0.001 and bitcoin is one day worth 10 000$.. well you do the math.
Most ASICs don't ROI right now, some run them only because of the network.
Most ASICs don't ROI right now, some run them only because of the network.
Yes, but competition won't allow that condition to last. The price of the bitcoin would have to fall, otherwise everyone would start mining. Assuming that it is more efficient for large companies to mine because they have more efficient computers then natural barriers to entry will force out your everyday miner. The only steady state I can see being realized is one where there are enormous companies dominating the mining, which will effectively destroy its internal regulation mechanism (that being that no one entity can influence it).