It is too complicated, there is no definite reference to become stable. All have the opportunity to be stable, don't just value bitcoin and ETH, then you are as if you are pessimistic about its future functions.
As expensive as any bitcoin and ETH value can still be purchased with certain fractions. I prefer to use coins that are certainly like BTC and ETH rather than having to find a stable coin that somehow doesn't necessarily mean that it can last long.