Success or failures of companies and the reasons doesn't make me happy or unhappy, I'm just looking at how the things happened.
Without Sony and Microsoft mistakes, 360 and PS4 situations would be very different, specially on 360 case, PS4 would be fine despite not being this huge success.
Ofcourse the market is based on competition and of course some do the right things while others do the wrong things but trying to suggest that something is based more on the wrongs of something than the rights of something else as the reason for a relative gap is like trying to argue whether the glass is half full or half empty.
Did Microsoft get it right by launching a year early with 360 or did Sony get it wrong launching a year late. There is no right answer.