Well, as I told the guy who runs the comic store I go to, this means I'll be saving some money during the run because I won't have to buy these once a month because they won't come out once a month.
True, and that when he leaves, the books will either be in shambles, have left over subplots the next writer has to complete, or be unfinished. He is almost the Larry Brown of comic book writers (which is a funny joke to anyone who follows the NBA).
As children we are taught to follow our dreams and that success is a journey that never ends. In life, as adults, we find out that most people are never successful and those who are only have to be ONCE, because they milk the memory of that forever after. It is irrelevant how JMS left ASM or even Thor; comics editors will always see him as Mr. Babylon 5. Just as Joss Whedon is always Mr. Buffy/Angel. Or how Claremont and even Bendis ride the coattails of their prior successes, which get further and further from the present every year.
I am not saying there are not those who remain successful, who are more reliable with top notch and complete quality work. I am merely saying it is rarer than some believe.
Although...in JMS' defense on THOR, most of the artists he worked with were hardly speedy. And his major failing in Thor, besides making the protagonist easily fooled by his #1 enemy, was making Thor a supporting character in his own book. If he avoids those mistakes in SUPERMAN or WONDER WOMAN and has a faster artist, it could help. Of course, we could see a scene where Superman accepts Lex Luthor's wonderful ideas and lets him room at the Fortress of Solitude to show there are no hard feelings...