Hey, I don't intend to add fuel to the fire of language wars as it has been a raging debate intense enough to rival the current US Democratic presidential aspirants.
But consider this. Now that SaaS is clearly going mainstream and as more and more businesses consider SaaSsyfying their applications, which programming language would most of them adopt?
Will they go the way of social network tools such as Facebook or Myspace that have scale as a driving force in choosing the language and/or follow the web site as web application principle to easily reach more customers for an easier learning curve?
Or will eventually cascade to advantages and risks that concern Ruby, Java, Php, Python and the others. Remember. we're talking implications on SaaS only.