while I do keep updated with the anime, I don't play the games constantly (the last time I played a pkmn game was about a year ago, I'm waiting for the english version of BW right now), and I'm not active on this forum at all.
But that doesn't mean I don't like pkmn. Pokemon is something I can never fully turn away from. I don't know how it is for other people, but for me, just because I'm not actively doing something pkmn related doesn't mean I'm losing interest in it. It's just like other things, you don't always have to be listening to songs to be interested in music (in fact I'd go crazy if I had to listen to music 24/7 just to show that I like music xD). If you really are "losing interest" in pkmn then take a break from it and come back later, I don't think anyone can be "into" something constantly without a few breaks or two doing something else. It's human nature to want to find something else that's more "new and exciting" when you've been doing the same thing for awhile.