If BNT starts outperforming the tokens that it is paired with, then the deficits should start to naturally close. You can look at https://analytics.bancor.network to get an idea for what the ENJ deficit has been over time (I will let you draw your own conclusions):
Most efforts within the Bancor community at the moment are on getting Carbon out which is a new protocol that is being developed. Most recently, the DAO voted to direct all fees from Carbon towards deficit reduction via BNT buyback and burn:
Additionally, there is also work being done on what’s called the “Fast Lane” which let’s the protocol capture arbitrage flows that would normally benefit outsiders:
Lastly, all fees from v2.1 and 90% from v3 are being used for BNT buy back to try to help alleviate any deficits across pools.