* Window NT in 1991. Displaced much better systems, on mass
* Node.js (my job) is simply dreadful. Mass adoption there too
* It took until 2015 to get half way to a replacement for C for real time systems. C is incredibly prone to failure - and it still has mass adoption. (Very tricky that one)
Popularity is a very bad metric for choosing computer systems.
(Unless you are looking for a job - see above for Node.js)
