With Power Rangers, they produced the show for 9 seasons (8 regular seasons and that reversion season). It took about five to six years after they purchased it before they actively went about trying to bury the show.
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It seemed so much shorter. Well, we'll see. I highly doubt they'll let SW wane, it's an internationally-recognized brand on the same level as any pop-culture character in modern history, they have changed US trademark law to ensure they don't lose Mickey Mouse, I can see them fighting that hard to ensure they don't waste the income made off Darth Vader.