I serously doubt any parent even considered for a moment, pulling their kid out of TKD based on anything that they saw in the olympics.
Regarding whether or not TKD will survive next years vote for it's inclusion in the 2016 games, well I can think of a few countries that will probably vote to keep it around. For many of these countries and others like them, TKD is seen as a decent shot of bringing home an easy medal. If it stays, that will likely be a big part of the reason.
Afghanistan won 1 medal in these games, 1 bronze and their first ever olympic medal. It was due to TKD.
Mens 58 kg (128 lbs), Bronze- R. Nikpai (Afghanistan)
Brazil won 15 medals in these games, 3 gold, 4 silver and 8 bronze. 1 bronze was due to TKD.
Womens +67 kg (+148 lbs), Bronze- Natália Falavigna (Brazil)
Canada won 18 medals in these games, 3 gold, 9 silver and 6 bronze. 1 silver was due to TKD.
Womens 67 kg (148 lbs), Silver- Karine Sergerie (Canada)
China and Chinese Taipei won 100 medals in these games, 51 gold, 21 silver and 28 bronze. 1 gold and 2 bronze were due to TKD.
Mens 80 kg (176 lbs), Bronze- Zhu Guo (China)
Womens 49 kg (108 lbs), Gold- J. Wu (China)
Mens 58 kg (128 lbs), Bronze- C. Yen (Chinese Taipei)
Croatia won 4 medals in these games, 2 silver and 2 bronze. Both bronze were due to TKD.
Womens 67 kg (148 lbs), Bronze- Sandra arić (Croatia)
Womens 57 kg (125 lbs), Bronze- Martina Zubcic (Croatia)
Cuba won 24 medals in these games, 2 gold, 11 silver and 11 bronze. 1 bronze was due to TKD.
Womens 49 kg (108 lbs), Bronze- D. Montejo (Cuba)
Dominican Republic won 2 medals in these games, 1 gold and 1 silver. The silver was due to TKD.
Mens 58 kg (128 lbs), Silver- Y. Mercedes (Dominican Republic)
France won 40 medals in these games, 7 gold, 16 silver and 17 bronze. 1 bronze was due to TKD.
Womens 67 kg (148 lbs), Bronze- Gwladys Épangue (France)
Great Britian won 47 medals in these games, 19 gold, 13 silver and 15 bronze. 1 bronze was due to TKD.
Womens +67 kg (+148 lbs), Bronze- Sarah Stevenson (Great Britian)
Greece won 4 medals in these games, 2 silver and 2 bronze. 1 silver due to TKD.
Mens +80 kg (+176 lbs), Silver- Alexandros Nikolaidis (Greece)
Iran won 2 medals in these games, 1 gold and 1 bronze. The gold was due to TKD.
Mens 80 kg (176 lbs), Gold- Hadi Saei (Iran)
Italy won 28 medals in these games, 8 gold, 10 silver and 10 bronze. 1 silver was due to TKD.
Mens 80 kg (176 lbs), Silver- Mauro Sarmiento (Italy)
Mexico won 3 medals in these games, 2 gold and 1 bronze. Both of the gold were due to TKD.
Womens +67 kg (+148 lbs), Gold- Maria Espinoza (Mexico)
Mens 58 kg (128 lbs), Gold- G. Perez (Mexico)
Nigeria won 4 medals in these games, 1 silver and 3 bronze. 2 bronze were due to TKD.
Mens +80 kg (+176 lbs), Bronze- Chika Chukwumerije (Nigeria)
Mens +80 kg (+176 lbs), Bronze- Arman Chilmanov (Nigeria)
Norway won 10 medals in these games, 3 gold, 5 silver and 2 bronze. 1 silver was due to TKD.
Womens +67 kg (+148 lbs), Silver- Nina Solheim (Norway)
South Korea won 31 medals in these games, 13 gold, 10 silver and 8 bronze. 4 of those 13 gold were due to TKD.
Mens +80 kg (+176 lbs), Gold- Cha Dong-Min (South Korea)
Womens 67 kg (148 lbs), Gold- Hwang Kyung-Seon (South Korea)
Mens 68 kg (128 lbs), Gold- Son, Tae-jin (South Korea)
Womens 57 kg (125 lbs), Gold- Lim Su-jeong (South. Korea)
Taiwan won 4 medals in these games, 4 bronze. 1 bronze was due to TKD.
Mens 68 kg (128 lbs), Bronze- Sung, Yu-Chi (Taiwan)
Thailand won 4 medals in these games, 2 gold and 2 silver. 1 silver was due to TKD.
Womens 49 kg (108 lbs), Silver- B. PuedPong (Thailand)
Turkey won 8 medals in these games, 1 gold, 4 silver and 3 bronze. 2 bronze were due to TKD.
Mens 68 kg (128 lbs), Bronze- Servet, Tezegul (Turkey)
Womens 57 kg (125 lbs), Silver- Azize Tanrikulu (Turkey)
Vietnam won 1 medal in these games, 1 bronze. It was due to TKD.
Womens 49 kg (108 lbs), Bronze- D. Contreras Rivero (Vietnam)
United States won 110 medals in these games, 36 gold 38 silver and 36 bronze. 1 silver and 2 bronze were due to TKD.
Womens 57 kg (125 lbs), Bronze- Diana Lopez (USA)
Mens 68 kg (128 lbs), Silver- Mark Lopez (USA)
Mens 80 kg (176 lbs), Bronze- Steven Lopez (USA)