If you knew anything about computer history you'd know that the GUI was inevitable. Steve & Bill may have popularized GUI interfaces through their positions but they weren't the only people thinking about computer graphics. In the same year the Macintosh was released 1984, Digital Research announced GEM & MIT announced X, Xerox was already developing their own graphics system.
In 1985 we got GEOS, AmigaOS, and the first shaky Windows.
The world could have gotten along fine without Apple or Microsoft. I personally would have been happy with an Amiga dominated PC industry. Hell, people were quite happy with VisiCalc before Excel ever appeared, and IBM did most of the work of killing off VisiCalc with Lotus-1-2-3, the first graphical spreadsheet program.
Speaking of myopic, most Apple fans would believe Apple not only invented fire, but made fire more stylish and desirable if Apple told them so.