The fact that rallying keeps loosing interested is related to the global changes in the population and the perception of cars and motorsport as a whole. Young people generally aren't very interested in cars or motorbikes like our fathers were. Today large majority of people don't understand a shit about cars. They buy them as a means of transport not as a part of the lifestyle like it used to be. It will get only worse with more and more automization and electronics inside them, the heavier and more restricted traffic etc.