i think it makes no difference whether there is a cap or not. If there is a cap, then people will post more to make up for their loss. This may lead to poor content because people are just posting to get votes and followers will always vote for the people they follow. Since Steemit is first to reward post by votes and where money is concerned fine tuning is required to find a balance. More hard forks will be required in the future to find the better solution.