Joe Snively is 28 years old. He's not going to be anything more than a fringe NHL player. Anyone trying to claim Hershey's success is a barometer of future Washington success shouldn't be including him.
Along the same lines, Ethen Frank is 26 and couldn't beat out guys like Sgarbossa, Aube-Kubel, or Phillips for roster spots, either out of camp or when the Capitals were banged up. Heck, the Caps called up Snively and Dube for cups of coffee and not Frank. His skating speed at least gives him one NHL-grade tool, so there's an off-chance he could get a few years in the NHL as a depth/energy forward, but it's far from guaranteed and he's not going to be the kind of primary offensive player in the NHL that he is in the AHL. See countless other undersized forwards among Bears alumni who couldn't translate their point production to the NHL ranks (Bourque, Aucoin, Matte, etc).
I love the Bears, I love this run they're on. Lapierre, in particular, is showing a ton of potential. But there's not a ton of NHL impact on that team, particularly at forward. Miro and Lapi are likely the only two career NHL forwards among the bunch, and if we're lucky Iorio and HHA can join them on the back-end. There's an outside shot that Rybinski or Trineyev could continue developing well and end up as a 3rd/4th liner, but that's still a couple years down the road and Trineyev in particular hasn't really been one of the play-drivers in these playoffs.