"Move over, Katniss. Tris is next in line."

I don't remember who said this, but it was a Divergent critic that was quoted at the beginning of the book. I don't particularly appreciate the comment because it's encouraging rivalry or competition between the two series. Possibly comments like this one could have been one of the reasons why some Hunger Games fans "don't like Divergent," because they still like the Hunger Games. They don't want another book to take its place. But why do the two series have to be rivals? Does Katniss really need to "move over" for Tris to have her chance? Can't they...