It won't happen. The producers want ratings and money through the phone lines. In order to achieve those goals, Michelle will need to stay there for a while longer and the public, not the least popular housemate in the history of the show, will need to be given the choice of who leaves.
The 'two to be evicted on Friday' rumour was another cynical ratings ploy. And it worked an absolute treat. Everyone in work was talking about BB on Thursday on Friday.
Can't fault the producers though. This series has been great.