I doubt JS will ever replace Python and I doubt that is what Armin believes. That doesn't mean it cannot hurt Python significantly in terms of popularity and market share.
If JS gets to improve in the future, so does Python. Again, apply the same standards in both cases, which is my real point. Ranting about "accounting only the positives of one alternative and only the negatives of the other" is a bit of a hobby of mine. You can make anything look good or bad that way, but that appearance has no relationship to truth. You can't make good decisions that way, but people do it surprisingly often.
Also, encoding was one example. I could rant for hours about the ways in which Python is more suitable than JS(-of-today) for medium-or-greater sized projects.
