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.