One concern I'd have is that people may change their minds in the 72 hours or indeed new circumstances may arise to swing them so there may be a cost in terms of deliberation. Also maybe this should also try and ensure every Senator gets to vote on it so that people get to see their Senators take an on the record stance. Maybe I'm misunderstanding but I feel I should share these concerns with the Senate.
On the first point, maybe if we extend the debate to a mandatory one-week debate? Or would that be too long?