Btw, has anyone paid close enough attention to the selfish-mining paper to observe that as the attackers hashrate approaches 50% of the network, his portion of the blocks won goes to 100%. 
You don't need to pay close attention. It is well known even without selfish mining that with 50+% you can reject all other blocks. I think Satoshi mentioned it.
Good point, but also note the selfish mining revenue equation shows that you get very close to 100% before you hit 50%.
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All the anonymity tech in the world is sort of useless against the state under this current situation.
Disagree. It is entirely possible the state has nothing to do with mining, nor will, and even with concentrated pools anonymity can still work. For example, perhaps the mining pools, even if concentrated, will jurisdiction shop the way the pirate bay does, or go more underground and become stateless (this could serve to decentralize them, since smaller pools are easier to hide). There are many such possibilities, not just the one guaranteed future of the state taking control of pools. That is certainly possible though.
IMO very naive. But okay.
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We need to fundamentally rethink the longest chain rule as it is currently formulated.
Not necessarily. Another solution would be radically reducing concentration.
Except that selfish mining starts at 25%, and creators of fiat can surely rent as much hashpower as they need when the time arises.
Your alternative would have to be very radical spread of mining. Wait, wasn't that what I've been suggesting...