hey i am from Jordan i dont know how to read or to understand Japanese language and i make many search to know the reason slam dunk stop producing and i find it had a good awards, had high popularity n Japan and in USA too and nthing for (why slam dunk stop producing?) even storyboards(manga story) stop but the story didnt end(thats wt i think)
so i wanna know the reason 
thats all thinks 
hope u will complete it...
keep it up :)