During times of high volatility, the bnUSD peg should be more elastic to react to extreme supply and demand. This proposal raises the rebalancing threshold from 2.5% to 8%.
BIP19 is a temporary solution until the rebalancing mechanism is further refined (discussion here). At a high-level, the longer-term solutions are likely to include an asymmetric peg, and a hard limit on the amount of bnUSD that can be rebalanced within a certain time period.