Why may pythons someday be in almost one-third of the united state?

The answer is: they actually won't! The map that was created to say that pythons would invade nearly 1/3 of the continental US was not peer-reviewed and was based off of yearly averages. As well as being biased since it was being funded by anti-pet organizations such as the HSUS. If the average winter temperatures were taken into consideration rather than assuming the temperatures stay the same year-round and averaging those, exotic pythons and boas would only be able to survive at the extreme southern tip of Florida and only maybe parts of Texas. Even in this area of Florida, they are dying off in greater numbers every winter due to lowering temperatures. They can definitely survive in Hawaii, but they cannot survive long-term in nearly any part of the continental US.