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Simplest explanation is that shows cost money to make and if there's no profit then the show gets cancelled. The OT peaked in popularity in the early 90s and Power Rangers basically killed it off so it was on life support pretty much after that, it's surprising it lasted as long as it did if you think about it and eventually it just wasn't worth it. 2k3 was also extremely lucky of being Laird's baby, being on Fox Box and being one of 4K!ds few original productions and not anime dub and kept getting renewed and got a second life with the 2007 movie. But like the OT once toy sales lowered and the other factors weren't good enough to keep it on it also got the axe.
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