Problem with this is that if the experimental treatments never get tried then even if cryonics works they will still be terminally ill when defrosted.

No one is going to remove someone from suspension if one can't cure whatever killed the person. That would be a waste of resources.

They should probably also make sure that there is some prize around for curing their specific illness with the hope that it will be easily solvable in the future, assuming the illness is relatively rare.

This is a really good idea.