It seems unlikely that the Texas attack will be the last one. ISIS sends a remarkably specific warning:
We have 71 trained soldiers in 15 different states ready at our word to attack any target we desire. Out of the 71 trained soldiers 23 have signed up for missions like Sunday, We are increasing in number bithnillah. Of the 15 states, 5 we will name… Virginia, Maryland, Illinois, California, and Michigan. The disbelievers who shot our brothers think that you killed someone untrained, nay, they gave you their bodies in plain view because we were watching.
The next six months will be interesting, To our Amir Al Mu’mineen make dua for us and continue your reign, May Allah enoble your face.
Then again, I would have thought they would have more trained soldiers than the Evil Legion of Evil.