I struggle to find any use case at all for my iPad. Even when traveling, I use my phone most of the time and when I want something bigger, I have the MacBook Air in my bag, which doesn't feel any more cumbersome to have with me than an iPad.
I won't really argue much. I can get by with just my iPhone. I think a MacBook (don't have an Air) is better for a lot of things even if the iPad is better for media on a plane. The weight difference is minimal if you count the keyboard. I don't draw so don't need an iPad for that. A Kindle weighs nothing so I can always bring that for reading.
Not sure I'll buy another iPad given my current lifestyle.
