Honestly, I don’t think he would have changed at all.
Of course he has changed since 2007 but you can’t expect every driver to be as relaxed as Jenson Button or Sebastian Vettel. Everyone is different in the way the react to public pressure and success.
From fans persepective I guess, he (Hamilton) will have changed in a “negative” way.
On his driving:
No, he has always been the Senna type; all or nothing.
I just think it was a bad season this year, as Timo Glock said on the Flying Lap, if things go wrong they mostly go wrong from the start to the end of the season.