Stablecoins are just a tool to measure cryptocurrencies' values. They are important when bitcoin's volatile, like at the time of writing this post. But just because of that doesn't mean that stablecoins are irreplaceable. In fact, if stablecoins didn't exist, cryptocurrencies would still live well and be valued under /BTC pairs. It's just like the old day, when goods were valued base on gold but USD or GBP.