Given the team’s recent proposal, MIP15: Activate the Protocol Fees Flow to the Marinade Foundation and Grant 100M MNDE to Marinade Labs for Operations which aims to provide the team with the budget they need to execute for at least 12 months and which will start accruing 100% of the revenues to the DAO, I think burning the rest of the overhang could make sense, if it cannot be allocated productively elsewhere.
According to the Realms link posted by the OP the treasury today contains 643M MNDE tokens. If we deduct 100M tokens from MIP-15, it should still be possible to burn 50% of the total supply.