These sort of grandiose statements have of course existed on the Internet for decades, but with the rise of demagogues like Trump, we see that such statements can be readily believed en masse without a second thought.
Could you provide data or numbers explaining that Ruby's package management system is a factor in new apps not being built in that language anymore?
I don't mean to necessarily add politics in here, but hastily throwing out intimidating messages--"Ruby's package manager is broken and now no one is using it; Node and others will of course head down the same path"--helps no one. First, it harms the morale of new programmers learning these languages who may be lead to believe they are wasting their time. Second, it frankly is rude to the groups of individuals who do work on the package managers themselves; if you have a better idea, build or sponser one.
The burden of proof is on you to provide these statistics, so until then, there's also the third result: it makes you look like a crank, not a professional who has considered the pros and cons of different package management systems.