What about miners? Decentralized as it may seem, the whole network relies on the continued activity of miners for its ability to keep transactions published, stored and secured. But with the advent of more and more powerful mining equipment, I say we could expect a marked decrease in the total number of miners active on the network (because not every ordinary Bitcoin holder finds it worth the trouble to participate with their meager GPU or CPU anymore) and all the mining activity gradually concentrated in fewer and fewer hands: those who can afford the ever more powerful and expensive mining rigs. Won't this then be the new central point of vulnerability of the whole Bitcoin system? What if the government one day decides Bitcoins are too troublesome and moves to shut down the biggest mining farms? Sure, mining will then become profitable for the average GPU owner again, but depending on how late in Bitcoin's adoption history this happens it could still be a major hit and loss of liquidity for a lot of people before the community reacts and steps in to replace the lost processing power and if the specialized hardware that needs replacing is too powerful the ordinary participants may not even be able to match what will have been lost even if every single Bitcoin owner steps in.
Thoughts?
there are actually some advantages for individuals who mine vs large institutions.
the individual can use the heat produced by his unit as an advantage, to supliment his heating costs during the winter. the large institution views all this heat as a liability not an asset, they must spend money to dispose of it.
The individual can "borrow" his parents electricity, the large institution must always pay for their electricity.
Furthermore economy of scale doesn't really benefit miners, not in the way it benefits steel mills or car manufacturing plants.