Depending on how Wiikman works out, Holt is either stuck in the ECHL or playing backup in the AHL. I can't imagine him as more than a career AHLer, though I'm sure at some point with some organization he'll get an emergency start or so. I don't think there's any real NHL potential there, and certainly no trade value. Goalies of his skill level are a dime a dozen.
The Fort is the kind of player who, on his very best day, could probably play a game in the NHL. I doubt he's good enough over an entire season to even really hold down an AHL starting job. As I recall, very little was expected of him in the first place, though. He doesn't project as an NHL'er, but really hasn't done that badly.
Holt might be able to be a backup in the distant future. He is still relatively young and I don't think he has totally tapped into his potential but obviously he will never be the type to push for a starting job.
At last year's training camp I spoke to Chris at length about broadcasting and he is very serious about doing that, after his playing days are done. As goalies generally take a lot longer to develop than players at any other position, it is hard to know at this point where Holt will top out. However, I believe that he may still become an AHL regular netminder. We should know much more by the end of this season.