I have inadvertently done this. The last fabric purchase I made was in January for my birthday present. I am still working on the quilt and it is a simple strip piece construction haha! I just don't have the $ for fabric right now, and have been busy home with a new baby. So for me, it has been pretty easy to avoid temptation - I just haven't set foot in a fabric store in 10 months! If I were to actually walk into one, that would be a different story. I am a batik addict and if I have learned anything it is that there will always be a beautiful batik in the fabric store.
Everywhere I go these days I ask myself, is it a WANT or a NEED? If it is a want, it doesn't come home with me.
I can't say I would be that successful just doing it for the heck of it though - my moratorium is born of necessity! I admire you ladies!