Michael Schumacher's departure will leave a void, but not for long as more and more rookies rise to the occasion, Formula One team principals believe. 'F1 is like a great movie,' Renault chief Flavio Briatore said yesterday at the Chinese Grand Prix. 'Whatever actors you have in this movie, sooner or later the actors stop, but the movie goes on. 'When [Ayrton] Senna and [Alain] Prost disappeared from the scene, people thought that was the end of the day for F1. But it didn't turn out to be the case.' The Italian's view was echoed by Mario Theissen, his counterpart at the BMW Sauber team, who happens to have two of the sport's most promising young talents. Sebastian Vettel, who is just 19, posted the second-fastest lap time (1:35:579) in yesterday's practice sessions, only four-hundredths of a second slower than Williams' Alexander Wurz. Shanghai will be only Vettel's third grand prix appearance after he became the youngest driver ever to reach the top level at the Turkish GP. Robert Kubica, 21, the Polish prodigy who rocketed on to the podium in only his third grand prix start in Italy three weeks ago, also drives for BMW. 'We continue to dig into the talent pool out there and it seems we have been rewarded earlier than we had expected,' said Theissen. Other prominent rising stars in the championship include German Nico Rosberg, 21, of the Williams team, and there has been much talk about Briton Lewis Hamilton, also 21, the newly-crowned GP2 series winner, thought by many to be a future winner on the big stage. But Ferrari's technical director, Ross Brawn, is concerned that the campaign to reduce testing in F1 could negatively affect youth development. 'The capacity to give young and new drivers chances behind the wheel are becoming more and more limited because the testing programme has been constrained and F1 is probably going to drop its third-car policy on the Friday of a grand prix weekend,' said Brawn. 'Both practices, particularly the third car running on the Friday, provide good opportunities for youngsters and we need to think of how to continue providing that kind of opportunity in the future.' The major teams in the championship, except for Ferrari, are pushing for a two-car running on Friday next season instead of the current system that allows three cars on the track in practice rounds. The grouping is keen to place further restrictions on testing mileage, which they feel would help reduce costs and cut into the advantage of cash-rich Ferrari. 'One alternative is to designate part of each team's testing mileage to those up-and-comers,' said Brawn. 'Of course, there would arise the need to apply specific criteria to that kind of driver but it's certainly an interesting idea to be introduced to the sport. 'After all, we need those new lads. They will keep the system going.'