I think the next two logical bonding curves would be something like DAI and RAI.
While having mostly ETH in PCV and having an issue of not being able to convert large amounts into other assets easily I think we can lean into ETH yield assets like stETH, Yearn, and Alpha Finance for example.
I think having a generic treasury contract which can hold assets and exchange using DCA on various AMMs would be a great central place that can allow for a wide variety of integrations. We can have whitelisted actions that can be taken by a community held multisig which operates under the direction of some kind of investment charter or snapshot votes.