I think it will. Especially when you can say, "If we can drop IE 6/7/8 support, development costs will go down significantly." Remember, it's not just JS compat

I think it will. Especially when you can say, "If we can drop IE 6/7/8 support, development costs will go down significantly." Remember, it's not just JS compatibility, think about all the CSS hacks you need to do to get your design just so. HTML 5 is another issue (I'm talking tag support). Requiring flash versions of your custom skinned player. There are so many factors we need to attach to old browsers, that it just makes sense to move forward. Maybe not right this second, but soon. And I think this is a great place to start.