> If the switch away from Ruby/Python/Perl to a newer language and eco-system allows you to achieve massive scale with less technologies and less moving parts,

> If the switch away from Ruby/Python/Perl to a newer language and eco-system allows you to achieve massive scale with less technologies and less moving parts, then you absolutely have a professional obligation to do so. To add: this is wrong from another perspective. There are more goals than "massive scale" in software development. Your main costs are wages, so anything that allows programmers to be much more productive (or cheap!) is good for your business. Therefore, settling on something like Python makes sense if you can leverage its ecosystem and the wide availability of the relevant skillsets. I won't be switching to Go until its ecosystem and popularity can compete with older languages.