A curious parallel train of thought that I have heard goes something like this:
As the number of Bitcoin nodes continues to decline and mining centralization continues to be an issue, does Bitcoin's decentralization become a less compelling argument in it's favor when compared with potentially looming blockchain offerings run by existing banking institutions?
Not my own argument but perhaps it is worth considering.
see:https://bitnodes.21.co/dashboard/?days=365https://blog.ethereum.org/2014/06/19/mining (from last year but still relevant)