George - neat.
I think one way to look at this is to wonder whether Jack's designing career would've happened at all if he'd won 'only' five majors.
If he'd won them spaced out by a few years, he'd be thought of historically more like Billy Casper; or if he'd won them all early in the 60s and then faded completely, he'd be thought of as some interesting failure.
Either way, I don't think he would've worked with Pete Dye, and I certainly don't think he would've been in a position to play such a big role in the 80s and 90s and beyond.
And, since the 80s and 90s were about big, green and gilded courses, I wonder if -- in the absence of one of that era's name brands -- something or someone else would've come along to fill the resulting void.
Of course, this presupposes that the mass of golfers (and developers) would've been open in the 80s and 90s to something less than big, bold and gilded.
Peter