That would be my first proposal for the party's delegates to vote on.... caps on the percentage of the reward pool that could be awarded to any one account per day.

From reading some Witness posts it appears they do vote on forks of the code. So if you had Witness agreement and developers to make it happen it should be doable.

Keep in mind that each day there is slightly less steem produced than the day before. In about 20 years there would be 95% less steem produced than today.

Couple that with the huge potential growth in the userbase. With present design there will be less rewards to reward a much greater amount of content. Caps seem one easy solution for scalability of the userbase.