There are over 600 million PCS(Payment, Clearing, Settlement) transactions per day in USA alone. To back this up, "blockchain" system will need infinite capacity since it needs to carry all the "ledgers".
Also, I doubt if China uses her government owned supercomputers to mine Bitcoin and alike, and sooner or later people will find out.
People used to say stuff like "solar power won't work" or "it's a fraud". Interestingly solar is still going on strong and the bitcoin ledger can still fit on a modestly sized SSD.
Pruning could be a long term solution - remove any fully spent transactions since they are no redundant. This article suggests that would leave under 1GB of data. Ditto some blockchains (like Ethereum) allow mining or block signing without the entire blockchain ledger - Bitcoin could probably migrate to that if it wanted. Other blockchains have yet other strategies still.
PS. "Infinite capacity" is always going to be a stretch in terms of storage. However I rather think you may be exagerating there ;-)
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I accept "Infinite capacity" is stretched a bit. But remember the entire nodes have to verify the ledger and the slowest machine will take the network to that level. It seems that everyone is assuming the individual computer is equipped with quad core CPU.., not the miners computer which may be a supercomputer somewhere..
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It works since 2009 and it will continue to work.
Only the mining nodes need to verify the ledger, all the other ones are just network noise. The individual user will have a tremendous amount of processing power which won't be needed by the average user.
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It seems to me that there are a lot of variations are on the way, but conceptually Blockchain will have to face the fact that it can not compete with blockless currencies which do not need miners such as IOTA.
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