I'm not sure of the exact ratio, but as far as I can tell, if they hadn't teamed up, Woz would have ended up an engineer at HP (or Google if it happened today) and Jobs would have ended up starting a cult or joining Scientology or something.
Maybe there would have been someone else to market Woz's genius, but I doubt they'd have done it better. Maybe Jobs would have found another Woz, but I doubt they'd have built as good of a product; Jobs would have been selling just as relentlessly, but a less compelling product.
They both had an important role to play. What came after? Who could have known.