If Obama were removed his electors could do anything they wished and turning to Clinton is not out of the question. Electors are completely free agents as per the Constitution.
A lot would depend on when the 'disqualification' took place. If it took place after the Electoral College met but before the inauguration then Biden is president per the 20th Amendment. If it took place after the electiob but before the Electoral College met, it's far more likely they would go to Biden since Clinton is not on the ticket.