.... and another PHP coder is born...
If ease of deployment is the primary concern, nothing beats PHP anyway, so either someone comes up with something even easier to deploy (and maintain) than mod_php or we've already ceded that cohort.
If the alternative is people switch to (say) Ruby or Python, then they're going to have a dilly of a time realizing that none of Django, Rails, Flask, Sinatra, et al are core libraries in their respective languages either.
Nothing in core should ever be allowed to become stale and outdated.
Without a small army of volunteers, how do you turn should not into does not?