If you go into a repair center, any technician worth his salt will look to see if they have another Epic that they are going to send back, and then swap the slide assembly. It's one whole piece that's pretty easy to replace, so I would just ask them to repair it, and not to replace it.
The only worry with a loose hinge piece like that it it may be rubbing against the ribbon cable that runs from the front half (LCD) to the back half (Circuit Board) and you might end up with a Black LCD or unusable touchscreen.