A reserve currency’s most important trait is liquidity. Since locked tokens are kept in a contract and can’t be used, you are trading your token's liquidity for yield. In the long term this doesn't make sense. The premise of a Decentralized Reserve Currency is for your tokens to be used as a medium for trading, as collateral, or to store wealth. That’s why veLocks staking will be an important change for Decentralized Reserve Currencies.