There is another factor in the Carstens "Post-mortem", beyond the drive to digitize everything, the sorry economy, the "Storm" or poor business practices etc. If you look at the similar threads, in any of the forums, you find a lot of people who "used" to subscribe / buy the magazine, who no longer purchased the magazine. Why? It has nothing to do with what can be read on an electronic device, but more to do with appealing content. I regularly read MR in magazine format, and MRH on line. I stopped subscribing to RMC, because most of the articles did not appeal to me, even though they normally were oriented to Northeastern railroads. I found it easier to preview the magazine at Barnes & Nobel and buy it only when something really interested me, rather than just getting every issue. Apparently, many others feel the same way.
Many publications, have lost appeal, due to changing interests of readers, others, simply became "tired". I think RMC falls into the "tired" category. It's demise is not related to the time sensitive nature of the "News Magazine", such as "Newsweek", or "USN&WR", or even the daily newspaper. People in this hobby, tend to seek out information about the hobby, from multiple sources, so a monthly magazine retains its relevancy as long as it's appealing to the reader. What happened to Carstens, was they lost their relevancy to their core reader. As such, even though they did offer a digital edition, they were no longer appealing to the majority.
Someone like White River, may put the "spark" back into RMC and R&R, because that is what's needed.