I wonder whether celebrities are less likely to be confined to a small niche now than in the past. I assume they are less constrained by geography, but audience

I wonder whether celebrities are less likely to be confined to a small niche now than in the past. I assume they are less constrained by geography, but audiences are more fragmented by the Internet, etc. Assuming a constant proportion of the population is famous and that more and more people know of a typical famous person over time, eventually every famous person would be known to everybody.