So, on the positive note, hows about replacing FAILED battery for, say, $15 while you wait, without the hassle of transferring any data back and forth? Just MHO...
As the iPad is supposed to be an easy computer, then your idea makes a lot more sense: quick, cheap and easy.
At the least, provide a service to copy the data to the replacement.
Otherwise you can just imagine a few years from now, thousands of people having to explain to their 85 year old parents how and why they have to backup their data before sending away their computer along with $100 for a battery replacement.