[dragonwriter]

> There are many other options, none of which enjoy the ubiquity of PHP (as far as being installed on such a vast majority of hosts).

What is this really an issue for? I mean, sure, there may be more choices of low-cost low-feature shared hosts that support PHP than other languages, but its hardly as if there aren't a sufficient quantity of low-cost (even, in some cases, with free tiers) platforms for apps in a wide variety of languages.

Unless you are literally compelled to choose a host at random, the fact that a randomly-chosen shared host is more likely to support PHP shouldn't really matter.