I would think that it would still remain invasive until such point as it doesn't have significant impact on the ecosystem and the economy there. That is the type of criterion we have: the significant impact.
If there ever comes a time where the EAB doesn't have a significant impact, or mountain pine beetle going to the east wouldn't have a significant impact, it may be that the range could be extended. Until such time, I don't know that we would not consider them invasive.