This is bullshit. In my whole experience as a full stack developer, after having tried various technologies and languages and frameworks - including ones built with PHP, Ruby, Scala, Javascript and Golang, I can this say with full confidence and can afford to put my name and credibility to stake - Nothing is going to replace Ruby on rails anytime soon. I wish something would, but nothing at the moment, is even close…
No one is taking Rails away from you. I don't think it's bullshit. There are use cases for each. I think Meteor offers up a good debate about "how we do development these days", and attempts to answer them, albeit early. Meteor is still new, and it's path is currently bumpy. But it tries, and innovation is a wonderful thing, that's what Rails gave us early on. The sad thing about Rails is it largely stagnated for some time while JS M.V.-whatevers sprouted. It couldn't solve realtime application building problems and provided no means for a client side implementation. And for the most part still does (although 4 supports SSEs). You just have to do so much glueing. One more: what about the inherently non-threadsafe nature of rubygems? How will Rails overcome being a threadsafe framework when it's dependancy mechanism has no safety check? I digress. These are solved problems on node, and it's something Rails still stagnates with. My point here is: Rails has issues too, big ones.
I can see Meteor either evolving nicely, or fading away. Keep in mind that it already has a growing community and development is backed with solid dollars & a passionate team.
I think the author is attempting to elude to the cargo-cult that hit Rails will migrate to Meteor. In time I believe many will. I think both communities will stay strong, and after enough time will begin to look like each other. Rails could learn a thing or two from Meteor. And conversely Meteor the same.