Both anime and live action have specific roles to fill within entertainment. It's a simple matter of fact that there are just some things that are impossible to do in Live Action, that are totally possible within an animated/drawn medium, and anime fills that role very, very well.
Personally, I think that you could take the same plot/story from any anime and with a Hollywood budget turn any Live Action into a thrilling drama action movie, on par with the latest Marvel movies. In fact, I'd argue that this contrast illustrates the fork between the two mediums quite well.
Marvel began as a series of comic book stories. The vast majority of anime begins as a manga story. Marvel clearly falls into the Live Action medium, using real people, CGI, and such. While anime relies upon animators and drawings, although CGI technology is showing prevalence within the animation industry.
I think if Live Action shows had the budget and attention to detail that a major movie production has, Live Action would be considerably more popular.