This is a great solution. The reward system should align with a personal preference recommendation system, recommending new exciting (personal preference matching) posts and further rewarding people to vote for what they actually like, to further recommend those posts to others in the same focus group. This is where steemit lacks the most right now and which could set it apart from many other solutions out there.
In this case, Reddit sets kind of a bad example for Steemit. Yeah you can choose subreddits you are interested in, but then again... Reddit does not have a reward system and if users feel like they miss out on rewards if the don't follow "mainstream propaganda", Substeems will diminish.
Other platforms like Facebook and in specific Quora set far better examples for Steemit going forward.