Universal reward pool currently exists to reward competition. There are funds out there that can be won without convincing stake holders to give something up. That competition is what creates HIVE's value. With SMT, it'd be the same kind of idea - a marketplace of ideas
It would be great to see 2nd layer (or SMT) communication networks, but we require a 1st layer reward pool tied to HIVE that allocates HIVE to the ideas most supported by various stake holders. The decentralized governance is required, and you can't have decentralized governance without communication. Best ideas are found in a competitive market place. There will be limited people interested in that, and it's easy enough for stakeholders to proxy their witness votes to another account
This is why 1st layer, immutable communication is required. Add the better stuff on top, for sure - there can be far better blogging solutions made on SMT or L2