Undergraduate degree holders would only be rewarded for completing degrees in in the US in emerging and vital fields (mostly STEM). Awarding permanent residency to someone completing an Bachelors in communication at the worst college in the US is simply inviting abuse. Master's holders would get permanent residency in an expanding set of fields and ideally PhDs in every field. There may be some cases of abuse, but there should never be the case where a smart person educated in the US, especially in a growing or important field is forced out of the country because they didn't win a lottery.