All arguments for not trying to revive the past are very valid. However I see no value in "identikit" events. Diversity is what makes things interesting. On a sporting level (whoever wins is a complete driver) and for the spectator.
Rallying's DNA is about diversity. Snow, gravel and dirt. Coping with dreadful wheather/poor road conditions (no safety car in rallying when it starts raining !). Amazing (and diffferent) sceneries. Multiple categories running the same event. Amateurs mixed with professionals. Etc ...
So in the end, I understand that the world is so different then in the 60's, that the costs have skyrocketed . But the value proposition argument (no manufactuer wants to spend a lot of money on rallying those days) is a bit of a chicken and egg thing. And i am conviced that if rallying would forget about the boring "identikit" format, it could raise its appeal.
So long story short, why wouldn't the championship mix short and long events, fast flowing and slow endurance events ? Monte Carlo could be a bit longer with night stages (the "final night", arriving in Monaco at dawn is a PR's dream, isn't it ?). Safari, Acropolis, Turkey, Cyprus or whatever on the rough side (not necessiraly long, but having drivers managing their effort) and then the actual super-fast, to the second sprints. In this picture, a somehow extended Safari (400 ? 500 km ? No one is talking of 5000km anymore !) could then be one of the series crown jewels, as it is iconic. Inversely, some sprint events could be shortened. Corsica used to be only 24hours ways back then and god it was one of the drivers preferred event !