If the cost of the drug is less than the cost of insulin, and it has been proven to offset or otherwise prevent long-term risks and complications, then it is worth it.You also have to consider what are the long term consequences of using a drug like this. Does it suppress or otherwise deactivate elements of the immune system? This is something about monoclonal antibodies that I'd be interested to know.

It would be interesting also to gather more long-term data on a drug like this.