...The proliferation of languages with linguistic and syntactual differences but little else to set them apart except a fan club. PHP, Ruby, Python, VB, Perl, all of them doing the same thing, serving the content.
I suppose the world would be a better place if we could all just agree on the One True Language instead of using different languages for different jobs or thinking about problems in different ways or playing around with different ways of implementing ideas? The languages you mentioned (PHP, Ruby, Python, VB, Perl) have very little in common except being interpreted. Although I understand the desire for a standard, it's as hard to see everyone agreeing on a single programming language, and its hard to buy the argument that the many languages available is hurting the web in any way. I could make the same argument about application development, but people still manage to do it.
The two most common things in the Universe are hydrogen and stupidity. -- Harlan Ellison