Ducks and Geese get sucked into jet engine intakes all the time when they get into the flight path of a jet airliner ... so there is no reason that a small drone positioned into the path of such an aircraft would not also be sucked into the engines ... or hit a control surface on a wing or hit the windshield ... regardless it is quite feasible. And viewing the Jeppesen Flight Database to get altitude and vector information is quite possible - not heavily restricted as one might think.
And we're currently only talking about inert hobby drones.
Consider a drone carrying few pounds of nitroglycerin or acetone peroxide hitting a wing fuel tank or the cockpit.