No, they'll be fine. Quoting Kurt Fisher <fisherka@csolutions.net>:
On August 17, NASA administrators concluded that the damaged tile on the underwing of the shuttle will not be repaired prior to reentry. See -
http://www.nasa.gov/mission_pages/shuttle/news/status-20070817.html
Damage to the tile extends fully through the tile to the aluminum structure underneath.
http://www.nasa.gov/mission_pages/shuttle/shuttlemissions/sts118/news/msb_08...
Should part of the Shuttle crew remain on the ISS and retun via a Souyez pickup?
- Kurt
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