Just to compare numbers… AMG started in 1988 and still on going (20 years).
Dragon Ball Z ended after 11 years (1984 to 1995). Hellsing ended after 11 years (1997 to 2008). Love Hina ended after 3 years (1998 to 2001). InuYasha ended after 12 years (1996 to 2008). Ranma 1/2 ended after 9 years (1987 to 1996).
Naruto first appeared in 1999, and comes off as a series that’s going to exceed 10+ years… but it appears to be coming to an eventual end within the next year or two. For example (MAJOR SPOILER): when faced with certain death against the big evil, Hinata confessed her absolute love to Naruto, bring him to 6 tail mode and pushing that long standing plot hook to an end.
I mean sure, you’ve got Golgo 13 running for 39 years (since 1969) - but AMG is no Golgo 13… not by a long shot.
Is Fujishima that hard up for new ideas? I know his other independent ventures have flopped (You’re Under Arrest and eX-Driver being the most notable. Sakura Taisen and the Tales of Series are not “his” so to speak) – but I think enough is enough.