I would not be surprised if Winnipeg makes a bid on him. Like the Riders, they have two roster spots for both punter and place kicer and their place kicker is also an import. Serna has been doing okay at place kicking, but the punter, Renauld, is only so-so right now.
This also depends if they are able to draft CIS PK Rob Maver, who I think the Bombers just may in the second round of 2010 if he is still available (which I think he probably will be early in the second round). This kid will be a good one and any team that gets him next season will be fortunate. I hear that he already has pro level leg strength and he is even getting some interest from the NFL.
I don't think the Riders will go after McCallum or draft a kicker next year. I think they are happy with Luca Congi's place kicking, (although he started out rather iffy this season) and Jamie Boreham is a favorite among the coaching staff. They may also bring back that kid they had the beginning of the season, Perri Scarelli, who is having a good year with the Regina Rams. He impressed Kavis Reed and I noticed that his average distance for punting this season is getting up over 40 yards which is pretty impressive for a university punter. There is also a kid kicking for the Saskatoon Hilltops Jrs, Chris Bodnar, who looks like he may be a good one too. He has also impressed Duane Ford.
I was sad to see McCallum run out of town. He was delightfully eccentric and I think for the most part, the team liked him and although he was never a great kicker, he was always a reliable one till that one nightmarish field goal attempt in Vancouver.