I was prompted to ponder this by the Retro Driver of the Year thread.
So many top drivers and emerging talents were sadly killed in the 60s and early 70s. What would the drivers and constructors championships have been like if drivers such as Clark, Rindt, Cevert, Siffert, Rodriguez, Williamson, Brise, Revson & Peterson not been killed. For instance would BRM have been more successful. Would some subsequent winning drivers have never made it to the top had the deaths not created vacant seats. Arguably the constructors championships may not have been much different as the top teams always attract the top drivers.
Im not suggesting there is a definitive answer to my question - i pose it merely to provoke discussion.