Easy, everyone, let the Youngs (and Sahlmans) of Newbury Park be. A degree of privilege and good fortune to live and train in Southern Cal? Of course. But literally hundreds of thousands of other youngsters from well-to-do and good weather locales in the U.S. have enjoyed the same over the decades. These kids have made the most of their opportunities; as the cyclists say in Europe, 'chapeau' (hats off) to them. They have given plenty to their school already; what they have done with their senior year is their right. 
As fans of distance running, it is equally okay to lament what could have been, however. Even if you add, say, two seconds per mile for use of super shoes/spikes (a rough guestimate, but a reasonable one after so much data accumulation these last few years), you're still looking at ludicrously great performances by two sets of brothers on one team at one time, plus a host of other very good runners. 
For me, the biggest 'what-ifs' among the 5 Youngs/Sahlmans are Leo and Aaron. Despite their historically excellent performances at 1500 (Leo) and 800 (Aaron), I believe both are even better 5000 runners at this stage. On the right day with the right competition at peak performance, Leo could have run anywhere from maybe 13:28 to 13:32 for another new record, while Aaron could have perhaps raced 13:40 to 13:50. In terms of relay potential this year, Leo & Aaron & Lex & Seymour could have reasonably achieved 16:25 or faster for a new 4 x 1 mile national record, and as low as 9:45-9:47 in the distance medley for another. So, our loss as fans. And the 3200/2 mile by itself? Shoot, Maybe Leo approaches or slightly breaks Verzbicas' 8:29.46 2-mile mark, while Lex and Aaron manage say 8:32 to 8:36 at best. Incredible, right? 
Meanwhile, time waits for no one, and there will always be other amazing runners in the pipeline to come. But we'll likely never see the likes of this Newbury Park team again.