OK, so here we have someone who knows PHP but not Git. Knowing PHP, probably they're a web developer and have also learned the standard stack there: HTML, CSS, Javascript, MySQL, and Subversion. And with the way the HTML5 family of technologies is exploding nowadays, that's no small feat.

You're saying that learning Git is going to be the barrier to someone switching to Ruby? Naw, don't think so.

We're making different assumptions. You're assuming a well-rounded web developer that just wants to deploy, while I'm thinking more from the beginner developer perspective. We're both right with our assumptions applied.