The last Whiz Kid has left the clubhouse. R.I.P. Obviously, they were well before my time but I grew up hearing plenty of stories about them, thanks largely to Whitey but also from some Greatest and Silent Generation fans who enjoyed that season.
I am not sure if it is a slam dunk that the Phillies were mistaken in letting them go. Looking back at their career pages at BR, both Roberts and Simmons tailed off a good bit in their last seasons in Philadelphia as the team tailed off around them. Both of their careers found second winds moving on the Orioles and Cardinals respectively. One can question whether they would have found those second winds if they stayed in Philadelphia, sans the change of scenery. Plus, one can argue that the the Phillies needed to completely turn the page from the Whiz Kids and embrace a new core and a new identity. Their situations are somewhat similar to Curt Schilling's when the Phillies moved on from him in 2000 as being with the Phillies was holding Schilling back from superstardom and, at the same time, the Phillies really needed to turn the last page from 1993.