I would dispute this claim. I think that assuming the core team is 100% honest there is still the possibility someone dishonest takes their keys.
We’re also figuring better solutions out, something probably likes staking and slashing (against malicious behaviors) would be a potential solution for the problem.
I don’t think that will solve the problem for the reasons listed Against proof of stake for [zk/op]rollup leader election
I think you would need to have some kind of fraud proof or valiidty proof on layer 1. Basically the rollup approach in order to decentralize control away from the core team.