But unless some form of full inspections or spraying N/S America wide for containers coming from overseas, we will probably have more of these.
With the direction/trend of the "US Gov." being run as a business for the past 40 years, I believe we could very well see these hornets arrive in other areas.
IIRC, there is a insect in the East that is killing millions of trees which arrived 10 or 20 years ago. I forgot the details but eradicating them is now impossible.