Definitely, because it’s that easy to get to the president.
You do realize that many of the present-day security measures taken around the president are
because of past assassinations and assassination attempts, right?
Lincoln didn't have a protection detail to speak of--in fact he'd only signed approval for the formation of the Secret Service that very day.
November 22, 1963 was the
last time a president rode in an open-top car.
Because of the attempt on Ronald Reagan in 1981, the president no longer walks from a building to his vehicle in the open air, and every person attending a presidential event goes through a metal detector.
Someone will successfully take a shot at another president in the future, because a shooter found an opening no one had considered before, and they'll change the protocols again.
Yes, contrary to the worldview of conspiracy theorists, accidents do happen even to important people.