Maybe under very exceptional circumstances, i.e. a systemic network risk. Since the DAO fiasco we've had a number of high profile incidents and the community has rejected stepping in (look at the failure of EIP 999). I'm not sure if there's presently anything on Ethereum, that should it fail, would be as bad as the DAO failure. Maybe MakerDAO?
I think they meant more system technical risk than financial. as in, a change to prevent bypassing private key checks, or minting quadrillions of BTC / ETH beyond the issuance schedule.
