There's another fascinating article on espn insider right now from Dr. Mark Adickes - who was the Rockets team physician in 2006-2010 when Yao Ming dealt with his navicular bone stress fracture injuries. He "projects" Embiid to make a full recovery and have a "solid" NBA career. Adickes makes several important points in which Embiid differs from Yao:
One - Ming was huge - significantly larger than Embiid, standing at 7'6, 310ish. This put a significantly higher amount of stress on his feet than Embiid's frame does.
Two - Ming originally suffered the injury in April 2006. At that time, Ming had already been playing professional basketball for almost a decade - first in China and then with the Rockets. He had a lot of mileage and wear and tear on his body which made it harder to heal from the injury.
Three - After Ming's original injury in April 06, he was put on crutches to heal without having surgery. He came back in the 06-07 season, played well and was named second-team All-NBA. He then suffered a recurrence the following year.
Four - Ming had extremely high arches in his feet, which placed added stress on the bones, and which he doubts Embiid has to the same degree.
In short, Embiid is certainly a risk with the back and foot issues at #6 (or even at #3 or 4 if we were able to trade up for that pick with, for instance, the 2015 Clippers pick and #6), but I think he is absolutely worth the risk. He is still quite young, and the upshot is that if he is able to get healthy, his upside as a rim-protector that can play on the post on offense is really phenomenal. If we can't get Love, I would try to figure out a way to get Embiid.