Per MLB.com --- http://m.mariners.mlb.com/news/article/150701624/felix-hernandez-leaves-early-with-stiff-elbow --- Felix really does want the 20. He is into the part of his career and this season where his individual record is important for the future.
I don't know whether the Ms could have done anything different for Edgar, but I'm sure Felix doesn't want to sit waiting for years to get in the HOF. If the Ms can do anything to make this year relevant, it would be to get Felix his IP/K run and 20 wins to keep his name in lights for the future.
And who knows, if the BP stays fixed and all the post-AS >.800 OPSes carry over to next year, he could go on a run of 20s. But it is crazy hard in this day of 32-34 starts than it was when 38-40 starts was routine. Nolan Ryan made 39 starts and 2 relief appearances to get 21 in 1973, and then 41 starts and 1 relief appearance to get 22 in 1974. Felix winning 20 in 32 starts, or in 32 starts and a relief appearance would still be outstanding by historical standards. Being so close, I hope they can get it for him.
I don't think Felix will get the Cy Young. But finishing at .500 as a team and getting him 20 are still achievable goals that would shine like stars after the way the season has played out for the Ms. Send the boys home hungry for the next step.