Why would William want to be political? As King he would need to be apolitical, so it is best to be like the Queen and keep his views private rather to be like his father with a document trail following behind him.
Also he is going to be King of multiple countries- definitely another reason to stay away from politics.
I actually agree. Charles has done a lot of good for the country in his position as Prince of Wales, but I've never liked the way he has tried to get involved in politics, however slight. I realise that he doesn't have the same restrictions on his position as the Queen does, but I always felt it was slightly overstepping the mark for him to be giving his opinion on political issues. I read in the DailyMail recently (which could just be a load of rubbish) that he was asked by a few MPs if he would be willing to give up his power to veto legislation when he is King. IF that is true, I can only guess it comes as a direct result of his tendency to make his political opinion known. William much more mirrors the Queen in this respect. Always diplomatic, never controversial.