2 benefits I can think of....
1) Save weight. Anyone know how much the 4 windows weigh? I'd guess at least 100 lbs (25 x 4). This, theoretically, would slightly lower the center of gravity.
2) The less weight will prolong the life of the power window motor.
BTW, the glass in the sunroof panel weighs about 12 lbs. I'd guess each side window would weigh quite a bit more than that.
I think the only way this would be viable is if the cost is reasonable and the ability to replace them when they become badly scratched. Reasonable cost being low enough to be able to replace them and not worry too much about it.
Ray, have you also thought about the rear window? Will you also be molding the windows to follow the factory glass curves?
