I'm not sure what the benefit of doing the cycle this way is for the university. Seems wildly inefficient, and just leaves early interviewees with more than half a years worth of concern. There are people with acceptances to out of state schools, who are holding out hope that they'll be accepted by their state school, instead of beginning to plan for their move across the country. I'll be matriculating to Phoenix regardless of what happens next week, and one of the many reasons why is due to the fact that I've been in post-interview limbo since September. Life goes on, and you have to start planning for what you know is a certainty.
UA-Tucson could do significantly better, in my opinion, if they follow UA-Phoenix's example. All applicants are told, at the interview, what specific day they will hear back. All applicants are either accepted or rejected, and a small portion are held by the committee for future reconsideration.
Maybe you could withdraw your app to ua-tucson if you are positive about attending another school so that they may review and accept another worthy applicant that may still be waiting to hear for their first admission.