Fitzpatrick, Alcock and McCutcheon would get contracts at pretty much all the other provinces. Alcock and McCutcheon possibly as depth players, but Fitzy would walk in to several starting 22s tomorrow if fit.
Hangers and Mumm would get contracts if teams needed depth. Hangers, for instance, would have been rather useful for the Force and Reds this year. And the Brumbies more recently.
Carter would get a contract most other places too. He's not starting right now at the Tahs, so you can hardly use the case that you wouldn't start him in front of 3 wallabies to argue your point. He's a bloody useful player with limitations. But there's no point arguing that one again.
All the players you list can play at a Super rugby level, but I think you are over estimating their ability or underestimating players at other franchises.
I like Cutch, and think Alcock has gone well this year (and much better than I thought he would I am happy to say), but really, the Reds (Gill, Beau), Brumbies (Hooper, Fainga'a), and Force (Pocock, Hodgson) would not have been interested in Cutch and/or Alcock being even squad players for 2012, as they all would've been happy with the opensides they have.
The Reds and Brumbies probably wouldn't have taken Hangers at the start of the season either. The Reds were happy with the injured Cooper, Lucas, Harris and Lance before the season started...that is, until Harris, Lucas and Lance all got injured as well. Then having a fifth decent five eight would've been great. (I wouldn't have been surprised if the Reds rated Cooper, Harris and Lucas all as better 5/8s than Hangers at the start of the 2012 season - not saying they are or are not.) Same with the Brumbies, who were probably pretty satisfied with To'omua and Lilo until both went down injured. Buying a player like Hangers for a third choice or even fourth/fifth choice 5/8 is just not an option for an Australian province, especially with the salary cap. Force would've loved him though, and if I remember correctly, they did give Hangers as offer last time he was off contract. No doubt the Force also would've loved to also have Carter.
I reckon you're right with Fitzpatrick though, as he'd be on the bench for most of the other Aus teams (although we're not short on quality back up hookers in Aus at the moment with Freier, Whittaker, and S. Finger/Hanson), and at the start of the season Mumm would've been a starter for any side bar the Reds (Horwill, Simmons).