It should be, but it come back to the author himself.Speaking of monthly manga: I don't know why Togashi put HxH on hiatus, but just theoretically: Do you think HxH coming back as a monthly manga would work out?
From what I know, togashi doesn't use asistant because he feel they can't convey the emotion in his drawing. So it will burden him to finish a 18 pages on weekly basis alone. So it could happen but he will still get hiatus.
Look at oda, dude have asistant but still take hiatus because the stress affect his health, just like togashi.
But I think togashi is more like berserk author who goes on indefinite hiatus.
The only author who could manage weekly release and even more is hiro mashima. Dude has the best workrate in the entire industry.