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Anons already said the answer with the writers and scripting so i'm gonna give the other side of the argument.
It's a commercial now. Digimon knew when to dip because things were getting stale. 02 is the equivalent of the Johto arc for Pokemon and both face similar issues with dropped arcs and such.
Tamers is quite literally what Pokemon needs to do. The show needs to make kids feel like they, too, can be a Pokemon Master.
Ash just overstayed his welcome. Jimmy would have been a good opportunity to pass the torch in the league but they blew that. Origins was also great for all of the first two episodes before it seemed like the writers realized they were just making a glorified commercial and wiped all of the soul out of it.