No your idea is futile because the negative effects of vote-selling will effect the entirety of the STEEM network, not just Steemit, so making an dApp on STEEM will not help.

I would like to know what you think about curation rewards. They were stated to have been about encouraging fair voting to ensure the best content creators and curators got the best rewards. So do you believe that these vote-selling whales should be receiving curation rewards for selling votes and impoverishing a vast proportion of the community? A proprtion that will only increase with each purchased vote, as the necessity to rely on bidbots is perpetuated by their use? That's worthy of rewarding in the supposed spirit of fair curation that is targeted at quality content??

And I want to reiterate a point that you do not seem to have understood. At one point, the best way to make money on Steemit was to post good content (or choke on a mobydick). But now, the best way to make money on Steemit - and nearing the only way - is to buy your upvotes. So, it doesn;t take a lot of foresight to see that as the importance moves away from content creation, and simply paying for votes becomes tolerated by all, then Steemit will be forced to go under some radical changes, evolving into something completely different from a content creation platform, because it isn't content that is being rewarded anymore, it's customers that are.