Just no. Dukes should be untouchable. They need to be powerful to give more weight to the position.
What I think should be changed is 'Royal Dukes'. If you become a duke you should lose 'Royal' status. It is almost impossible to remove these people.
No, dukes are too untouchable. The protest mechanic is a reasonable limit on them. A royal duke can be protested out of the duchy, if not the royal status.
