Similar to self-driving cars, I think the last 1% of the way is going to be the near-insurmountable barrier that makes widespread implementation difficult or potentially impossible. For tasks where you can plausibly check the results with some kind of external software harness, or defer double-checking to a person, these models will make development quick (if resource-intensive). But any kind of fully-automated complex process where the consequences are important will be tough to hand over to black-box generators.