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.