Is Mid-to-Late 90s GT1 the fastest a class has ever evolved?

1994 - Ferrari F40

1995 - McLaren F1 GTR

1996 - Porsche GT1

1997 - Mercedes-Benz CLK GTR

1998 - Toyota GT-One

1999 - *Dead*

Each year brought forth a new car that crushed the previous year's competitors. The class was abandoned by the FIA GT series for the 99 season and became the GTP class for Le Mans 99.

I can't think of another class that evolved so quickly and killed itself off in the history of sports car racing.