It's not so much about having a Vasi and Kucherov in the system as much as it is guys like Gourde, Palat, Cirelli, Gudas, Johnson. All those veterans you mentioned lost their jobs to the kids and the kids were better for it.
Detroit's system is looking pretty good even if no one is looking like a future 100 point scorer or Vezina winner. Mazur, Kasper, Danielson, Soderblom and Berggren are going to be battling it out with Fischer, Kostin, Copp, Perron and Veleno for forward spots. Wallinder, Edvinsson, Johansson and Sandin-Pelikka are going to battle Gostisbehere, Holl, Chiarot and Maatta for spots. Whoever is better will in theory get the spot.