These questions always spring to mind when an incident of this nature occurs. We had an identical situation when María de Villota lost her life in 2013 following a serious incident in testing, also for Marussia F1.
I have thought about Jules every day since his accident in October last year, and the recent news that he lost his battle for survival was just completely soul-destroying. Formula One is hurting right now, it will take an extraordinary amount of time to recover from this. In fact, the sport will probably never will recover. We can no longer say that Formula One features the best drivers; not without Jules.
Although cruelly cut short, the French driver had an extraordinary F1 career. He absolutely dominated his team mate, Max Chilton, in an identical car, sometimes by margins that were previously unheard of. He even scored points for Marussia in Monaco - a breathtaking effort. Jules quickly established himself as one of the most talented drivers on the grid, and it is now no secret that Ferrari were considering promoting him from their driver academy to a race seat. Jules managed to build a great reputation while driving for Marussia which quite simply stunning when you consider that a driver as talented as Nico Hulkenberg has driven for three midfield teams, demonstrated his skill, won Le Mans, and still can not get into a "big name" team.
Jules' aim in Formula One will have eventually been to become a World Champion one day. He will have wanted to create history, and a legacy for the Bianchi name. While he never got the opportunity to achieve major success at the top level, he has definitely generated a legacy. As a direct result of Jules' accident it became immediately obvious that the double waved yellow flag system was flawed. As Martin Brundle explains in the video below, double yellow flags still leaves the speed of travel up to the discretion of the drivers. In order to take this away, the virtual safety car has been brought in where the FIA determines a minimum time period for cars between points on the circuit. This means the drivers now have to slow down considerably in this situation. This development will prevent similar incidents in the future, and this is the legacy that Jules leaves behind. His accident and the resultant regulation changes will prevent further injuries to other drivers, and potentially even save lives. This instantly makes him a legend of Formula One.
Jules, we miss you. We will never forget you.