I think worst case he is going to be a successful HP engineer, definitely not as rich but can probably still retire early and do some teachings.

Success in itself is not a sufficient condition of happiness. How many unhappy billionairs are out there?

That would be my guess. Or you can even consider that him focusing on happiness led to success.

(For his definition of success, which I would agree with, but not everyone would)

Even in another universe, if such thing exists, I can imagine Woz is just as successful, if not more, than he is here.

Research suggests happiness often precedes success rather than following from it - Woz likely would have found joy in engineering and creation regardless of financial outcomes.