Spot on.richard_leeds wrote:yener - The reason Hill didn't win another WDC was because he was dumped and joined Arrows. Similarly Schumacher let Benetton in 1996 for Ferrari. Alonso left Renault for McLaren.
So that's three of your examples irrelevant, unless you expect Vettel to drive for someone else next year?
As others have commented, the common thread is the presence of Newey.
If Schumi stayed at Benetton for 96, he would have had a much better chance at the championship, and if Newey stayed at Williams in 97 and beyond then they probably would have had a championship challenging car in 98.
In this case, neither Vettel nor Newey (nor any other key member of staff) is leaving Red Bull. Whilst there are no massive changes in the rules, the only thing that could possibly bring the competition closer is the changes to the position of the exhausts.