I can't deny that pokemon needs a plot change. I mean, I used to be such a fan of pokemon that I dressed as Ash Catchem for Holloween once, and even I'm getting tired of the repetitive plot. Although I fully recognize this animation was made before Black and White versions, I still wish to say that I do think in those games, the honestly attempted to alter the plot, tried and failed, but still tried. I think the main issue is they're being too careful, kind of applying the "If it ain't broken, don't fix it." principle too much. They're probably more doing so after Rangers and Mystery Dungeons.
As far as the hire someone else comment, it's not quite as simple as it may sound. This is something I didn't know until a couple weeks ago, so feel free to research it yourself if you want, but, for some traditional reason, Japan doesn't import foreign products. I'm not sure if hiring a non-Japanese company would count or not, but if it does, finding the right story writer would be a lot more difficult. Also, I will slap myself if Game Freak isn't Japanese. Just to be clear, they are fine with exporting to other countries, just not importing from them.
So, again, I agree that they need to put that pokemon making aside, cause 9XX is enough for a while and make a better plot, but I don't think this issue is being COMPLETELY ignored either.
If you wish to discuss this further, I would be happy to and promise to do my best not to go, "Well you're just jealous because pokemon is so awesome and you aren't cool enough for it." Also, I apologize if anything I say doesn't make sense. I'm kind of the type of guy that has just enough wit to realize he lacks in it.
Side note: Though I wouldn't be the best to take this from, as I think I even need to be more picky in life, I personally was fine with the plot in Mystery Dungeons. I mean, it wasn't the best, but I liked it. It was the game mechanics that got my disapproval. I have no opinion on any of the Pokemon Rangers games as I played non of them.