Unfortunately I still think the Oilers win a cup in the next couple years. If not, it’s by pure management incompetence.
Having the best player in the world carry you is not the path to success. Pittsburgh had Sid, but they also had Malkin and Letang and elite goaltending performances. Pittsburgh 1.0 had Mario, but they also had Jagr and Coffey. Edmonton 1.0 was stacked as Messier et al even won the Cup after Gretzky left.
Draisaitl, RNH, Boucher, Hyman, Nurse... these guys put up numbers thanks to McDavid but they're closer in talent level to Huberdeau, Backlund, Miromanov, Pospisil, and Zadorov than core players anyone would build a contending roster around. Ekholm is a good player, but basically just a glorified Chris Tanev.
Basically the Oilers without McDavid are last year's Flames without Kylington, Kadri, Zary, Andersson, and Sharangovich.
That McDavid could elevate such a brutal roster to the Cup Final was both an incredible individual feat worthy of the Conn Smythe, and a testament to how important luck is in the playoffs as that is the only reason they even made it past the second round.
If the Oilers want to legitimately content they need so much more roster talent. They won't get every break ever again, and Zach Hyman probably won't ever have such a remarkable season as a #2 option ever again. Leon Draisaitl will continue to put up empty numbers in blowouts inflated by perfect McDavid passes but never have the impact on the game the Oilers fanbase mistakenly believe in.