You do realize that's exactly what we have now:
"A single organization dictating what my mempool should look like."
If we stop filtering by DEFAULT (PLEASE READ THIS WORD) and let everyone do what they want, then no one person or implementation of filters or set of nodes is going to dictate anything, where our current implementation of DEFAULTS (THIS IS THE IMPORTANT WORD IN THIS SENTENCE) is precisely a single dominant organization setting up the policy that blocks some transactions from propogating without back channels. These transactions are financially viable. People demand them, god help them.