Kain Warwick and Benjamin Celermajer, core contributors to Synthetix, have submitted a SIP-423 proposal to phase out sUSD and reform the SNX staking mechanism. The proposal includes freezing sUSD on the Ethereum mainnet and Optimism, allowing holders to exchange 1 sUSD for 4 SNX, canceling the original sUSD pledge ratio requirement, and transferring the remaining debt to a new pledge model. If the income exceeds 10 million US dollars within 2 years of the agreement, 25% will be distributed in USDT form to the old sUSD holders.