I still don't see how this won't just lead to the most conscientious owners ending up with an even greater share of the talent.
I'm all in favor of more work bringing better results, but I think your scenario would more likely just lead to "ant" teams trading three bums to "grasshopper" teams in return for a marginal prospect (or better, depending on the world's veto habits).
Too many worlds have too few minor league FA, especially position players, but you're never going to correct this without somehow addressing the number of players who retire. I rarely have more than 5 or 6 retire, because I release guys I don't plan to promote at the end of the season, but obviously not everyone does the same. I see plenty of quality owners with 20 retirements every offseason. That drains the talent pool.