I can completely sympathize. As much as I have defended my clutter in the past, I have finally seen the light and am scaling down. Only problem, I can't stand the thought of getting rid of anything
So far, I have quit acquiring Hasbro (until the fullsize unleashed return ), my Gentle Giant has hit the road (only excepting 4 busts), quit collecting 1/6 scale, and for purely financial reasons have scaled way back on higher end preorders.
So far seems to be working, although very hard to stick to sometimes.
And limited access by the kids can be a big help too. We have 4 kids (6, 4, and 2 year old twins). They are only allowed in if mom or dad are there too.