This post you mention does seem interesting and I hope someone finds it. In the meantime, regarding the relationship between bitcoin and alt-coins...
I've been slowly developing the opinion that the alt-coins are simply going to provide extra liquidity. As bitcoin transactions become more expensive because of the bloating of the blockchain and the demands on the network to process an increasing number of transactions per second, alt-coins will fill the gap for smaller, cheaper, transactions.
I can envision a world where a bitcoin transaction might carry a mandatory fee of, say, .001 BTC (keep in mind, cavirtex already charges this amount for withdrawls) If bitcoin someday is worth $100,000 this would amount to a minimum fee of 100 dollars per transaction, meaning buying a coffee with bitcoin would be a very expensive proposition. I foresee the alt-coins as filling the gap and providing layers to facilitate all nature of transactions, but bitcoin will remain the gold standard.
Please note: My "slowly developing opinion" is not fully formed and I would welcome any debate on this subject.
-Thank you.