Did not read TFA, but my immediate thought on seeing this headline is "No, it won't". Why? Because software never really seems to die. Look at the billions of lines of COBOL or PL/I or FORTRAN still in use around the world. Look at the fact that (a few) people still use OS/2, which is about as dead as software ever really gets.
Rails may well find it's popularity and prestige diminished, but I doubt it'll "die" anytime in any of our lifetimes.
100% agree here. Way to many Rails developers around for it to die. Also as cool as Meteor is, and it's pretty cool. There is a huge continent of developers that will resist javascript for as long as possible, because even though it is ubiquitous, let's be honesty, it does suck in a number of ways. Ruby / Python / Go / etc.. are all so much nicer languages from a developer happiness perspective. Ultimately javascript will become more and more prevalent for sure, and Meteor along with it, but only because all the browsers decided to support it, NOT because of developer happiness.
Rails may well find it's popularity and prestige diminished, but I doubt it'll "die" anytime in any of our lifetimes.