The show fails because where is the "one half man". Jake is long past puberty and is in the realm of historic adulthood. He is marrying age.
Sheen, unfortunately, is never coming back, either to the show or to normalcy. He is a good example of why drugs are the wrong way to go. Too bad, because he use to be a very smart and likable person, but he wrecked his brain chemistry. There is no coming back from that. The show will limp along for one season, then they will take it off life support.
Hopefully Sheen will get income for all the reruns, which will go on for longer than he is alive. They are still showing I Love Lucy reruns somewhere, I am sure. Sheen will have to cut back on expenses, but he is not going to be broke and homeless.