I certainly would not say that Bourne made Bond obsolete. Bourne is simply the "modern" era Bond, but Bond had been evolving over the decades. In 10 years, we'll have another Bond to make Bourne "obsolete" if you're only considering the most current version worthwhile (many would disagree).
As for previous decades, we did have lots of movies based on existing material, and though nothing is totally original, many of the great films were more original, and this was far more frequent in the past. The Leone films, Kurosawa's films, many of Kubrick's films and Hitchcock's films, Peckinpah's films, Woody Allen's films, Citizen Kane, Network, Chinatown, the Apartment, etc. We see some of that now, but it's not in the pubic consciousness like it used to be. Instead, movies based on theme park rides, comics, toys, older movies and TV shows, etc. dominate everything.