What's the point of the sovereignty movement? Would the federal government give up Puerto Rico if they wanted to be independent? I would just assume the answer to that is no, but I'm not up on PR current events, so if I'm wrong - let me know.
Why wouldn't the government give up Puerto Rico? With the closing of Viequez and most military bases there, it's no longer of much strategic interest. And I'm sure the federal government spends more supporting Puerto Rico than it takes in in revenue. If Puerto Ricans want to go their separate ways, let them - and revoke the US citizenship of those who were born there from parents who also were born there (or at least make sure their children aren't automatically granted citizenship by birth).
The two-tier vote system from the bill is fundamentally flawed, especially since a plurality rules on the second ballot and "sovereignty with free association" is somewhat meaningless. And forcing revotes until Puerto Ricans give the "correct" answer is a disturbing tactic. Let Puerto Rico decide when and how often to decide their status. That shouldn't be mandated.