First, the suggestion of revising the standardised approach to be sufficiently risk-sensitive thus creating a credible alternative to the internal models. And second, the requirement of mandatory calculation and publication of the standardised approach by all banks, which would improve transparency and comparability. Note that separation of trading-based risks from deposit banking can also be seen as a form of robust regulation.
If potential errors in the measurement of trading risks may prove fatal to core banking services, it may be better to move the risks elsewhere altogether. This is what separation does: it compartmentalizes risks within the banking group, a bit like firewalls help restrict the spreading of fire.