BLS-based RANDAO can easily be replaced with hash-based
The original hash-based RANDAO (outlined here by V) has exactly the same biasability problems (last-revealer manipulation attacks (aka selfish mixing), and forking attacks) just like the current BLS-based construction. Swapping out the cryptographic component to a post-quantum secure one does not automatically solve the randomness beacon’s biasability issues. If this is a concern (I’d argue it is quite a concern), then we also need to redesign the beacon protocol itself.