This proposal is split from the discussion that has happened in this thread
https://gov.bancor.network/t/proposal-to-start-sunsetting-bancor-v3/4279
and Bancorians should read that post to have an understanding about this proposal
TL;DR
Summary
This is fairly simple and straight forward. Setting the funding limit to 0 on a Bancor 3 pool means that it no longer trades as there is no BNT liquidity allocated to it. Any BNT liquidity currently allocated to the pool is burned.
Set the funding limit to 0 on the USDC pool if it is currently in surplus. Otherwise, if at any point in the future of this proposal passing the pool goes into surplus then the funding limit can be set to 0.
Do nothing.