Whether or not to replace the rig is a moot point... you really have no choice unless you're prepared to dump the boat, essentially.
Is insurance involved? That will change the picture too. If you've lost confidence in the boat and want to change/upgrade, you'll still be better off fixing this one first, as has already been suggested.
Also, not to beat you up, but "hoping to get another season" out a suspect rig is just asking for exactly what you got!
You were right to jettison the broken rig to avoid further damage. I'm willing to bet that there were some holed Irwin Citations in any of the various recent hurricanes - it's quite likely that an entire rig and sail inventory will be readily available.
Best of luck.