I'm sure many will scream "RACIST!!" at this measure...but
If Trump was really racist against Muslims, he would have added Indonesia (the most populous) Muslim nation in the world to the list of banned countries.  He didn't. Because they have their terrorism under control.

Also the countries on the list will maybe have to crack down more on their own Islamic terror groups (Al-Shabab, Al-Qaeda, Boko Harem etc...etc.) now that the problem has become their problem and not the west's. 

I blame radical Islamist groups like Isis and Boko Harem etc... for this order being necessary.
I imagine these measures will only be in place until the radical Islam terror war is won.