I read though this article and I think it is great! Moreover, I think you can also address 2 things in it:
1. bitUSD and bitCNY are not just stablecoins. Besides having price stability, bitUSD and bitCNY also have yields for holders (not for issuers in nubits). This could be a good reason why people would choose bitUSD/CNY over other stablecoins (i.e., additional values).
2. In the final section of this article:
Customers will buy stablecoins when they need them, and merchants can sell them upon receipt until they trust them.
In my opinoin, people would buy bitcoins when they need them, and store in stablecoins for the rest of time. It is because bitcoin has price volatility and stablecoins like bitUSD/CNY have yields. Therefore, bitcoin is only 'a method of transmitting money', as Warren Buffett said, and stablecoins are meant to be kept for longer times.