Don't even compare Tendulkar to Lara or Bradman. Tendulkar is a GREAT batsman, but he is not a genius or someone who can even be compared to Lara or Bradman.
Tendulkar will continue play at least as long as the match fee is 1 lakh plus, regardless of his own personal form or whether the country wins anything.
Lara and Bradman loved the game and got their records because of that. Tendulkar loves his records and plays the game for those.