I don't know if the community still thinks the delegate registration fee is still a problem that might deter potential profitable delegates from signing up. But if it's the case, then what about changing it so instead of delegates having to pay and thus risk 2 weeks salary, they simply can't create their salary transaction in the first 1200 blocks they produce?
It makes it less risky for potential attackers to register rogue 100% delegates, but there will still be 2 weeks for the community to rally and react in those situations. On the other hand it will make new delegates feel a lot more welcome, and this is what I think should be our greatest priority at the moment.