Is it possible? Sure, anything is possible. Is it likely this will happen to you? Highly unlikely. There could be a few explanations here: could be a simple case of user abuse or perhaps it is a stroke of bad luck for the owner who happened to get a defective iPhone.
Whatever the case may be - do not panic! This is a single report - TiPb has found no other cases of users having this very issue, even within the 10 page thread linked above. Nobody really knows what really happened here so there's really no need to worry. Start to worry when flocks of people start having issues with it.
Until then, sit back, relax, and enjoy your iPhone 3GS.