Woz did two magic things just in the Apple II which no one else was close to: the hack for the ntsc color, and the disk drive not needing a completely separate CPU. In the late 70s that ability is what enabled the Apple II to succeed.
The point is Woz is a hacker. Once you build a system more properly, with pieces used how their designers explicitly intended, you end up with the Mac (and things like Sun SPARCstafions) which does not have space for Woz to use his lateral thinking talents.
It's foolish for any of us to peer inside the crystal ball of "what would Jobs be without Woz", but I think it is important to acknowledge that the Apple II and IIc pretty much bankrolled Apple through their pre-Macintosh era. Without those first few gigs (which Woz is almost single-handedly responsible for), Apple Computers wouldn't have existed as early (or successfully) as it did. Maybe we still would have gotten an iPhone later down the line, but that's frankly too speculative for any of us to call.