The real question is if that battle really is worth fighting. The app-for-a-site really is trying to reinvent the web, and so far it is not much more than a bubble, done only to give an image of 'technological advancedness', when in fact, you're reinventing the wheel. You cannot win that fight - there are just too many sites that are 'important' and are changing way too quickly. As soon as novelty wears of and sofware development reality kicks in, someone will realize IE/FFox quirks were a pain, but re-developing and maintaining your site in half a dozen technologies, and, worse even, optimizing it for various versions, screen sizes and input methods is a Mission Impossible compared to that.