I don't know if this is what he was trying to say, but it makes a little more sense if you change it to NoSQL's hype will never die, but it will eventually get

I don't know if this is what he was trying to say, but it makes a little more sense if you change it to NoSQL's hype will never die, but it will eventually get marginalized, like how Rails' hype was marginalized by NoSQL's hype.