@NeuroticFish Thats a good point. But what @ranochigo says is much more valid. If the block reward is "only" 6000$ per block, and a 1Million dollar transaction could be forged for 100.000$ worth of mining equiptment and electricity the transaction cannot be trusted. But maybe its a good thing, that in the future big transaction cannot be trusted.
Half of the network is probably now secured by $10k a piece machines that would blow the circuits in a lot of houses when plugged in yet we're facing a threat of centralization because of the $200 2tb ssd. Really?
In my understanding its the mining pools that have the control so there are already 5 Pools that control over 50+% of the hashrate. So it doesnt matter that the pool itself is decentralized.
@franky1 your point "a" makes no sense, but "b" and "c" are valid.