The Sony name helped quite a bit as far as public perception was concerned. Without question. But ultimately it was their wide licensing practices that ensured the platform had something for everyone that kept it growing.
As for the whole blue ocean strategy, once that business model finds its home, the blue ocean becomes a red ocean as competition moves in search of success in the same territory. There are no permanent rights to a market for getting there first.
At this point having strong brand recognition and a working product for broad and new demographics continues to bring success, but there is no such thing as permanent success; it's always a moving target.