If you’re lucky you will have a closet with enough carpet to patch in the damaged area. Acetone on carpet is probably not ideal since it is a solvent for many of the synthetic fibers.
Losing a carpet to a paint leak is a passage of life. Happens to everyone eventually. Some people just go bigger than others, and it sounds like your husband totaled some pretty big areas. I’ll bet he upgrades his drop cloth coverage next time. Don’t ask how I know.