Unless you're a total wimp, the iPad's weight should be a non-issue.
If you read books, the weight is definitely an issue. On my Kindle, I can read for four hours straight without any strain on arm; with my iPad, after 1 hour, my arm is strained. This is without resting my arm against something ( my preference for reading). Of course I can rest either my iPad or arm against something, but it's is not as comfortable.
Anyway, as long as they keep the really long battery life, I am fine if they keep the weight.