I'm sorry to hear about the news of The Ghost and Molly McGee, it's always sad when your favorite show has to end.
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Two of my favorite shows (Futurama and Metalocalypse) ended in the early 2010's, so I know how you feel.
In my opinion, I think it's better to end a series once ideas start running low, otherwise it becomes boring and tasteless as more seasons keep being reproduced. I'm not sure if that was the case for TGaMM, though.