So true.
It has not been that long ago when it was considered total sacrilege for a big man to shoot perimeter jump shots. Guys like Jim McDaniels and Patrick Ewing took a lot of heat for not developing a back to the basket game.
As far as shooting guards becoming extinct, I just feel that players develop more aspects of their game now, probably because of expectations, because of the influence of popular players, and, as mentioned, the increasing importance of defense.