I feel this is a major plot point.
If he could manage to stay hidden alone, he could stay hidden with his kids as well.
Why leave them behind if he misses them so much?
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Sign up to join this communityGenerally, when people try to "disappear" in real life, it is through their children that they eventually get found. Here's one article about the difficulties in long term disappearances. And wasn't the top still spinning after he went outside with his kids at the end (which would indicate that his wife was correct about them still being stuck in a shared dream)?
"If he could manage to stay hidden alone, he could stay hidden with his kids as well" doesn't hold water. A lone adult has tremendously more mobility and flexibility than one trying to take care of a couple of kids. How is a fugitive going to send his kids to school? When he has to pull up stakes and leave for another country on five minutes' notice because the wrong person found out where he was, might his kids complicate that? Is he a big enough asshole to pull his kids away from their family, friends, entire social context in order to take them with him on the run, and then keep doing that repeatedly?
If he loves his kids, making them fugitives alongside him is not exactly the most caring thing to do.
The movie shows the urgency with which he left, and the fact that his lawyer had only made plans for him to escape.
The Thin Man offers Cobb the piece of paper. A CHILD'S SHOUT - Cobb TURNS. Ariadne follows his gaze to the garden. A small blonde boy faces away from them, crouched on his haunches to look at something on the ground.
There's a bit about the children then...
The Thin Man thrusts the paper into Cobb's hand.
THIN MAN: Right now. Or never, Cobb.
Cobb nods, turns from the window
So that's the simple answer - he didn't plan his getaway, his lawyer did. And only for him. Running out of the country isn't as simple as most movies make it seem, and apparently he had the law on his trail in an immediate sense, making it even more difficult.
One possibility is that his wife was right - he's still in a dreamworld. The world of the movie does have some odd aspects. In that case, it's part of a bad dream.