Short answer: no.
One CEO getting shot is not going to change much. The American public's attention span is two weeks, if that. Another CEO in the endless line of corporate douchebags will take the spot of the murdered one and so on. All the lousy crap that led to our fucking useless health care system is still in place: CEOs with no heart/conscience, health industry lobbyists, spineless politicians for sale to the highest bidder.
For sure, this was an exceptional event, but it's not going to lead to any lasting change. Disagree with me? Post your prediction for what will change one year from now and let's see what happens. My guess is NOTHING.
I would argue anyone participating in the company, even someone washing the floors at night is helping to perpetuate it. Definitely not to the degree of the CEO, but every single worker there is helping to sustain the system.