I wouldn't put my money on Mills not taking an offer. IIRC He's made noises about being a starter. Which he will not do here unless Murray's development fails... Not getting to be a starter and significantly less pay; suggests to me that he won't turn down an offer that gives him both.
I agree the bench is going to be an issue, but guess what, the salary cap can squeeze a team. If Patty leaves, we can likely afford one mid-high level player, be it Dedmon, Tyreke, or whomever. After that we are going to be fishing with exceptions, pretty small ones. Also, regarding Rim protection, do you remember some of the dark years from 08-11, some the "big" men that were helping TD? In 10/11 in order of minutes played (and more than 300 minutes) TD, Blair, Bonner, McDyess, Splitter. In 09/10 TD, McDyess, Blair, Bonner. In 08/09 TD, Bonner, Kurt Thomas, Oberto, Gooden. I'm not so sure that Pop values rim protection as much as you do...