As much as I dislike Michael Schumacher I don't think he will take Fernando Alonso out if he gets the chance. If he wasn't retiring this year i'm pretty sure he would try and take Alonso out but it's because he has a lot to lose from the fans and F1 pundits if he does and he wouldn't be retiring on so much of a high.
We'll have to wait and see though, he has done it twice before afterall.