I would say that if you aren't yet married, be prepared to dump them if they won't sign up with you. Because if they won't, that is a strong signal to you that they are not a good spouse. These kinds of signals are important to pay attention to in the courtship process.

After marriage, you are hooked regardless of what decision they make on their own suspension arrangements, because it's their own life. You've entered the contract, and the fact they want to do something stupid does not change that. But you should consider dumping them if they refuse to help with the process (at least in simple matters like calling Alcor), as that actually crosses the line into betrayal (however passive) and could get you killed.