I have posted this on another thread but in my opinion 10 delistings is very realistic -
Delistings
Jonhson, Bowden, Simmonds, Petts, JON, Cogs plus possibly Brown and Polak.
Hughes could also be a potential exclusion but given the amount in front of him and his age he will more than likely be retained.
Trades
Raines, Schulz and possibly even Tuck and/or Patto.
Yep hard to disagree with your outs Stripes. The 10-15 players would include rookies too.
Retired: Johnson, Bowden, Simmonds, Cogs, Polak, Browny?
Delisted: JON, Petts, Gourdis*, Silvester*?
Trade options: Schulz, Hughes, Raines, Patto, Tuck
Payout: McMahon?
Kingy rumouredly may have a performance clause in contract?
Thomson should be another but he's contracted as well

.
It's not hard to come up with 15 names. All depends on contracts and if any other clubs are stupid enough to offer anything during trade week. We'll have plenty of cap space to play with given all the senior players leaving so that won't be an issue.