By the end it seemed to me that he had told the story he wanted to tell with those characters, it always felt very much like a finite tale.
I think ending at 42, which is exactly divisible by 6, for the 7 trades - and just the right size for the omnibus edition which very quickly followed, was quite deliberate - perhaps it wasn’t planned exactly for 42 issues from the start, but I think he had a an idea of where he wanted to go with it.
Also, Motor Girl seemed to come out pretty quickly after, which seemed planned - so there doesn’t look the be an abrupt wrap up.
It certainly didn’t read that way to me either.
I actually felt it was wrapped up better than Y the Last Man to be honest. But I thought the ending to that was pretty meh. Pretty pish payoff for what was a very enjoyable journey.