One can regard the entire regulatory reform program, which aims to strengthen the resilience of banks and the banking system to shocks, as dealing with the TBTF problem by reducing the probability that any bank will get into trouble. There are, however, some aspects of the financial reform program that deal specifically with large banks.
The most important such measure is the work on resolution mechanisms for SIFIs, including the very difficult case of  31  If this lecture had been delivered in 2005, I would have added the British banking system to the above list. This is evidence that the regulatory structure also matters.