According to some scientists, it is quite unlikely that a hypercane would form, even in the most dire global warming situation. To create such a catastrophic storm, parts of the ocean would have to reach temperatures of at least 100 degrees. Only the impact of a large asteroid hitting the tropical ocean or a massive undersea volcano could generate such intense heating. It might have happened at least once in our past, though. A few scientists believe that hypercanes caused by these things could have contributed to massive global extinctions in the past.

So, a hypercane is theoretically possible, but it would need a huge trigger to produce the conditions needed to support one.

As for global warming, a number of scientists have dismissed links between tropical activity and the phenomenon, but in the decades to come, perhaps we will see some evidence of a link.