I think so - if I get a new interest, the existing one(s) do tend to get overlooked. In some way I seem to have a very simple mind, and I only seem able to really get into one thing at a time. Most of the things I do require some acquisition of skill, and I'm often horrified at how rusty I can become if I leave off an interest for a little while. It comes back if I make an effort, but that can take some doing. I have to write detailed notes to myself so I won't be confused if I come back to a task after a few days of ignoring it.
I've heard it said that special interests tend to dininish if social performance improves, and I can believe it. Whenever I got a new girlfriend, my other interests would seem to vanish instantly, until things soured and I'd run out of ideas for making things right again, then the special interests would return. I'm a progress junkie.