I think although Alonso's first attempt at McLaren didnt work out now that Alonso will have had a year to cool down at Renault and now that he knows Hamilton would be his equal he would do well to go back to McLaren. If he is better than Hamilton he will win on merit and if not he will still do very well out of it. All depends on whether the break last year was terminal and if he is willing to be joint number 1.