I think Hadley and Houlihan will stay because they are good players. I can't see any reason to get rid of Houlihan at the moment because he is a really good player. Might be worth looking at trading Betts as they could get a reasonable deal for him and he hasn't been in the best of form. The rest as mentioned should definatly go

Ackland, Saddington and Benjamin are pretty much certain to go if their contracts are up. The former two are older and can't get selected, so there's no future there. Benjamin hasn't shown anything in his two years with the club and will be the first guy out the door.
Anderson, Bannister, Ellard and Blackwell may be out the door. Anderson hasn't been able to get back into the seniors, Bannister will probably be pushed out because he's older and guys like Gibbs can now play his role. Ellard is too small, and will go the way of Ross Young. Blackwell doesn't fit on a list with Hadley and Bentick.
Wiggins, Edwards, Hartlett, Houlihan, Aisake O'hAilpin and Russell are possibilities to go. I think Wiggins will probably stay, because we are so light on forwards, and unless there is improvement this year, I don't think Edwards will provide that; there may be discussion about Hartlett due to his injury-prone nature, but I think they will persevere unless medical advice says otherwise, because he is good when he's fit. If Hoops cannot be a good rebounding player when he gets back into the team this year, his age will probably work against him. Aisake will probably get one more year to find a place, but may otherwise we written off. Russell has his detractors amongst fans, but I don't think he's missed a game this year - this either means that the club has faith in him, in which case he's safe, or they're giving him this season to show his worth under a coach who uses him properly, in which case he's still probably safe because he's shown plenty of good form and there's a lot of blokes who'd be delisted before him.

I definately think Cain Ackland needs to go along with Jason Saddington. These 2 especially are a waste of air. I think there has to be a huge question mark next to Aisake O'hailpin and maybe either of the two aboriginal boys in Anderson and Benjamin.
Getting rid of too many players has been carltons problem for a number of years now where I think they could have given a few players in the past a longer life span.
However in saying that there may have to be a question mark next to Ellard and good trade bait would be a player like Jordan Russell, but he is showing big improvements. Blues need to inject more speed onto their list. Im a huge wrap for a bullants player in Aaron Joseph. Hes not only lightning quick hes also tough and can kick goals. Apart from the guys mentioned the others are safe i'd say.