While there's work to be done on BBR itself, growth is more likely to come from 3rd parties building things to increase activity. It's not like anyone needs permission from CZ to keep BBR growing. We're probably at an impasse now where people who want to build things are nervous that CZ has abandoned BBR, and CZ himself is not sure if there's enough interest still in BBR to continue. So it's a chicken and egg situation.
Here's a possible base case to halt the recursive chicken and egg situation:
Zoidberg recognizes a Bus Factor of One is an emergency, and begins the process of blunting the learning curve for (commenting/refactoring) BBR/CN's "notoriously odd code base."
Between AEON, BBR, and XDN, there is a race on to be the Litecoin of Cryptonote. LTC got to 2nd place with ~one dev, but can any of them?
OK, XDN technically/by market cap already has. But you know what I mean - CZ can't do it alone! Nobody can now, because Satoshi and coblee already did. Market leaders ETH and Ripple employ and deploy teams of executives, managers, coders, marketers, and lawyers...