Have to imagine we'd see more of Wotherspoon in the middle if Millar left. Otherwise we're left with three cloggers.
I'd be sad to see Millar leave, but it's only 12 months since we were all raging because he could only last thirty minutes per game. In terms of contribution to the team, he's probably been one of the worst over the past two seasons, purely due to injuries, so is the obvious candidate to move on of you're looking to free up wages. Seems a bit heartless, but you can't really carry folk purely for sentimental reasons.
Edit: see folk saying Millar hasn't actually been injured. Sure I now remember people saying he was forced out the squad to prevent an extension clause being triggered last year too. Seems a bit shite from the club, if it's all true, tbh.