I think most burmese pythons in the everglades came from a breeding facility that was destroyed in hurricane Andrew, not from irresponsible owners.
On another note, there are TONS of other invasive species in North America: http://en.wikipedia.org/wiki/List_of..._North_America . I wonder why rats, cats, dogs etc aren't banned from being transported across state lines... I think its ridiculous that they made the laws restricting owning them as pets, since the problem is already there and irreversible.
I highly doubt hunting will help much with the problem.