Hmmmmm..... I slept on it, and still don't know what I'll do yet.
Doesn't really seem like we're helping you out, then.
Take pictures of the Hasselblad, and pack it up as if you're selling it. Pack it up really well, to the point that you will not want to unpack it again.
Then live with it like that for a while and see if you can do completely without it. If you don't miss it and leave the box alone without even thinking about unpacking it - get rid of it.
If you have inclinations to open up the box and use the camera, there is obviously a need for you to keep it.
I'm currently on a mission where I'm using up all of my medium format film, and won't use any other camera until I do. That means that I have two Pentax SLRs, one Leica M, a Canon EOS3, and a few gadget cameras sitting there on the shelf, staring at me... It's mighty tempting to grab one of them for fun, but I've promised myself not to do it. It's so that I will have a good excuse to send the camera, lenses, and backs out for CLA and much needed repair, but I need there to be no film left before I do, or I will want to keep using it the Hasselblad.
Maybe that's something you can do - limit yourself to one format for a while and just don't look the other way? Either use the Hasselblad exclusively, or 35mm exclusively, and see how much you 'miss' the other format when you do.
Sorry if any of my notes are redundant and making it more complicated for you.