Ethereum co-founder Vitalik Buterin isn't sugarcoating things when it comes to decentralized stablecoins. In a post on X this past Sunday, he spelled out three big problems that the crypto world still hasn't figured out, and he's not convinced the current designs are built to last.

First up: why is everyone still pegging everything to the U.S. dollar? Buterin pointed out that most decentralized stablecoins use the dollar as their anchor, which feels limiting. He suggested that future stablecoins might work better if they tracked broader price indexes or purchasing power metrics instead of betting everything on one currency.

Then there's the oracle problem. Oracles are the systems that feed real-world data into blockchains, and Buterin emphasized just how vulnerable they are. If someone compromises an oracle, the entire stablecoin system built on top of it is toast.

The third issue? Staking yield. Buterin described it as a hidden source of conflict within decentralized stablecoins, and he made it clear these weren't meant to be solutions, just examples of how narrow the design space actually is.

Beyond those three points, Buterin warned that decentralized stablecoins can't just sit on fixed collateral levels and hope for the best. They need mechanisms to dynamically rebalance during wild market swings if they want any chance of staying solvent.

What's striking here is that Buterin is basically saying the crypto industry has made progress, sure, but these fundamental design challenges remain unsolved. Dollar dependence, oracle risks, and staking tensions aren't minor details. They're structural questions that go to the heart of whether decentralized stablecoins can actually work over the long haul.