I haven't really considered it, but I suppose my husband would donate it all to charity. I doubt my daughter would want any of it, but if she did, he'd make sure she gets whatever she wants.
My bigger concern has been what will happen to my mother's things when she goes - she has two rooms full of quilting & sewing supplies, which are to come to me. I likely won't keep everything, but I could never let her sewing machines go. They are like a part of her - she's sewn my whole life, and many nights I went to sleep hearing the hum of her machine going deep into the night, making us clothing. If my dad goes before her, or if they go at the same time, God forbid, I will have to race my sister to their house, because she thinks everything in there is "junk" and she will toss it all.
Whatever your wishes are, put them all in writing! Don't leave it to others to determine what will happen to your treasures.