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the average CN viewer didn't have the patience for a beautiful animated show that took its time (and didn't have a lot of dialog).

It's hard to say. On one hand, the lack of dialog may be a turn-off to some. On the other hand, it make the show far more accessible to non-English speakers. It's far easier to take Samurai Jack and redo it in every language, making it cheaper to market internationally. So, even if CN cut the cord, you'd think Hanna Barbera would have an incentive to keep it going.