I think the reason Taylor Swift is still on the top of the pop charts is simply because her fans love her music and almost everything else about her. She listens and responds to her fans and she is constantly coming up with new ideas.
For example, not too long ago she launched a new social networking app just for her fans called The Swift Life. You only have to check out her Twitter feed to see some other more specific reasons why her fans love her. Here is one of my favorites: “#IStandWithTaylor because she helped me be happy with who I am, and taught me to love myself, even if others don't”.
As someone who began her career in the country music genre and then exploded into the pop world after several successful albums, many fans and critics alike often ask the question how does Taylor Swift still manage to rise to the top of the pop charts.
The answer is that she continually evolves her music to fit whatever is popular at the time and she, and her team, are very good at being able to predict future music trends so she is often the first person to capitalize on the trends. She is always listening to different music genres and gaining more inspirations from music in other genres, languages, and time periods.