instead of cutting out a whole quilt you do not want to work on why not just put the fabric for it along with the pattern together in a large ziplock or box - label it & put in on a shelf until you do want to make it?
my ufo's tend to be pieced blocks not made into a top yet- or a top not yet quilted & bound- the first---blocks are in a pizza box or ziplock- the tops are under the quilting machine waiting for me to get to them.
i never cut a whole quilt out at once-unless i am going to work on it to completion...if i want to make it someday i may put the fabric & pattern together so i don't use the fabrics for something else- then later i can pull it out---look at it & decide if i really want to make that quilt or if i want to use the fabrics for something else- if they were all cut out i would be 'stuck'