well I personally don't think the anime is getting worse. Some characters may be lacking in personality and development (especially some of the female traveling partners), but from what I've seen from BW so far it's not as bad, I'm actually looking forward to the BW arc :D. As for the change in voice actors, I didn't like the new voices at first but after awhile I liked some of them better than the old ones. It's the same thing with pokemon designs when gen V came out - they're really not that bad (the designs and the anime, I mean), we just need time to get used to them. No anime is perfect, there are many flaws in pokemon, that's for sure, but I'm pretty sure an anime isn't meant to be analyzed like a literary essay anyway. While it's true that there are lots of fillers and most episodes are 'cliche', I like watching it just because it's pokemon and it's nice to watch a non-serious anime from time to time. If you don't like it, then just don't watch it, no one's forcing anyone to watch the anime.
I guess most people don't like the anime anymore because they've grown up and it doesn't appeal to them as much. It's a shame that the pokemon anime receives so much criticism just because people have grown up while the anime hasn't. In most cases, people only play the games because everything else "pokemon" seems childish (at least this is the feeling I'm getting everywhere). I only know one other person IRL who is my age and watches the anime closely xD
btw, the only thing I don't like about the anime is how Ash loses all the experience he gains in his previous journeys when he starts a new one xD
[edit] about the creators taking out the 'adult stuff' from the anime, I don't think there were that many in the original series in the first place. And if there were, I think it's because of the dub, not the actual show. There's a difference in the script for the english and japanese dubs, mainly because the english script writers try to make TR sound witty (which I don't think works that well) xD