I completely agree that pokemon is overdone...extremely.
However, pokemon caters to the years, and an age group. Not a specific generation, unfortunately.
Sure they could have continued the story to a point where ash ages, and have done soemthing unique with it.
But, they simply decided, business-wise... catering to that specific age group would grant them more money than catering to all of their fans, including their first generation of fans.
Business makes me sick.
Personally, I'd say a large number of those 12 episode animes are too long. They could have been done in such a shorter peiod of time, or as a movie, rather than being a complete mock up of each other.
There are of course many good 12-episode animes.
I'm not here to bash.
Personally I don't really watch any anime, less I'm in the mood for a short-running one, for this very reason.
Stick w/ manga even if soem of them are huge. I can flip through 18 pages quicker than watch a 20 minutes video.