TL;DR
Summary
This is fairly simple and straight forward. Gas on Ethereum spikes to huge prices (especially with the MEME coin excitement).
As a consequence, the cost to a caller in gas is very often more expensive than the 100 BNT reward.
This results in no incentive for anyone to trigger the contract => arbs are not closed => the protocol does not enjoy the benefit.
Proposed Solution
Edit the caller reward cap to 1,000 BNT. This should mean that the system can continue to run even in extreme gas situation.
Update the BNT reward cap for the caller to 1,000 BNT
Do nothing.