This blog posting of yours is confusing on a lot of levels. Are you implying that BTS is a currency now and that BitUSD isn't good because it's too stable? That stability is bad?
I think while most people want stability you have some who want slight deflation or slight inflation. I do think there is a place for stability but it's questionable in my opinion whether or not we even need a universal currency.
It's possible that user issued assets could become personal currencies. It's possible that instead of one currency to rule them all the ideal state is to have many currencies or that all businesses lend their own currencies into existence as credit currencies.
Credit currencies need not be stable as long as whatever they are measured against is stable. The collateral has to be stable to act as good collateral because if the value of the collateral fluctuates then it is more difficult to lend credit currencies into existence.
Overall though your blog post has generated some confusion. Maybe it's just me.