Here's what gets me about the Modern keyboard: It is a beautiful keyboard, no doubt about it, with a great 'feel' of the keys and it's quiet. I just can't see spending $130 on a keyboard. C'mon Microsoft and Logitech ... where do you get off charging like that for a keyboard? I paid $15 for my keyboard (Logitech K360) and you know something ... I like it.
The Scroll Lock key might still be used by thousands of internal applications that we never hear about. Also, I think Excel still uses it. But in any case, it's not so bad to have an extra key that you can re-map to do whatever.