Well written piece indeed, but flawed as well...
Because it's focused on just one aspect: "Incentives to secure the network (which is Mining)".
Not only will happen what he writes: "The only solace is that, in the long run, the system should self-correct, as miners drop out and mining gets easier". This self-correcting will happen much faster than he imagines. Halve the current system is just as secure, and this volume runs on very low costs already and will only become more efficient by evolving technology.
But, what he doesn't comprehend is that a significant amount of investment money (about 500 million) that otherwise would be invested in Mining-farms, will now be rerouted to Bitcoin and distributed-ledger related startups and software-projects. This will grow the ecosystem greatly, and thereby boost it all.