Hakstol was hired to preside over a rebuild, if Hextall had been clear that it was a rebuild, that he was building around future goalies (Hart, Sandstrom, et al) and that the scrubs were the price of a rebuild (notice even this year we replace Weise and Lehtera with Varone and Vorobyev, not exactly a huge upgrade, even Fletcher hasn't promoted Myers or Friedman, and so on), the fans would have been more patient.
But Hextall probably wasn't allowed to mention the dirty word b/c of a front office headed by Holmgren with marching orders from Scott - so fans were lead to expect a competitive team when history tells you it takes 6-7 years or so to rebuild a franchise from the bottom up.
Yes, they had a half dozen good young players, B Schenn was traded for value and L Schenn was dumped, we're down to Giroux, Couts, Voracek and Simmonds from the 2014-15 Flyers. The players in the pipeline, Ghost, Laughton, Hagg, Morin, Stolarz [Cousins, Leier, Manning] weren't enough to rebuild an AHL team.
So they still managed to make the playoffs twice in four years, and may squeeze in this year, despite rebuilding the team with young talent. Flyers have 6 players from that 2014-15 team left, (the big four plus Raffl and MacDonald), and 4 prospects from before Hextall on the current team.