I think we are just going through a major transition period at the moment. It used to be magazines that ruled. They were cheap to make, there was a big audience as the Internet didn't exist, and therefore even a niche publication picked up quite a healthy readership.
Now paper and printing costs a fortune, no one buys mags anymore, and the Internet has taught us all to expect free content. It looks as though it is going to stay that way for the Internet as a general hub of information. But tablets and e-readers will bring something new and different.
The best example of this so far is Flipboard. I'm focusing on the presentation here more than sourced content:
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We now have services like Crunchyroll bringing us media, then lots of publications with disparate info about anime and manga. Producing content in digital form is very inexpensive, even compared to old magazine production costs. So factor in cheap tablets, a digital magazine that combines video, up-to-date information, social features, and a small price tag (say £4.99 a month) and I think you have a compelling publication again for the hardcore anime crowd.
It would need some good hooks, like a Shonen Jump-style manga preview section every month, early access to first episodes of anime, but that's very doable and something publishers would be open to if it was streamed content. I would certainly pay for something like that.