This is just untrue. Plenty of high performance products are Python based, just look at Instagram, Dropbox etc.
Python is only winning a few niche markets like numerical computation, statistics. and biology...which most developers are not in. If you are trying to learn a language to get a job, you're probably not wanting to look at small niche industries to work in.
Of course you can build billion dollar companies in any language, but that wasn't the question or comment being discussed.