I'm not inherently against the external treasury proposal, but it requires a legal structure and is complicated to implement in a responsible manner. It's definitely beyond the time availability I have to do something like that, but if someone else puts forward a credible plan I would consider supporting it.
There is a similar situation with organizing a well-funded and well-led development and marketing effort that is more than a bunch of random disconnected proposals. Having the DAO fund an entity that can organize and lead such an effort (like Steemit), while remaining accountable to the stakeholders (unlike Steemit), would be a good thing in my view, but again it is complicated to implement and requires a significant commitment of organizational and leadership resources.
RE: Why I set my witness HBD interest rate parameter to 3%