Well, doesnt to me.. The song shows they were pushed a lot. I guess at some point, you get used or become used to stuff.
Now, if the kids' father had pushed his younger son really hard in TZP (Darshal Safary, the dyslexic) , like his elder son. who knows he might have become a brillant tennis player.And Parakshit Sahini had pushed Madhavan despite his wish, maybe he could have become a super-duper engineer.
Sounds absurd? Well then, how do you justify him pushing kids hard, atleast in the beginning in Dangal. Ofcourse, the movie may show that the father realising that he should not push hard, & letting go & then the girls themselves choosing to wrestle. But the point remains...