I would have thought the authorities are to well aware of the limited capabilities of RC planes and the like to cause damage in an attack such as was planned. What you may see from this is tighter restrictions on imports of illegal equipment from China that make attacks like the planned one easier to implement.
Now as it says in the report, private pilots on a death wish could inflict much more damage and their efforts I would have thought will be more focussed on them.. BUT who knows..
Dave