Is a bone graft beneficial if I never get an implant?

A few years ago I had to have my last two molars on the upper left removed and the next tooth had a root canal and was waiting on a crown lengthening, post and crown. A week ago that tooth broke off at/below the gum line. I have quite a bit of bone loss from the previous extractions as seen on the xray. The dentist wants me to have the perio in their office remove the root tips and place a bone graft (cadaver) and membrane with the option for an implant eventually. My insurance will pay for all but the implant, which I was quoted to be nearly $5000. Obviously chewing is an issue and I need something back there but I don’t forsee ever being able to afford the implant. My dentist said a partial is an option if I can’t do the implant. I am not entirely comfortable with idea of the bone graft to begin with. My question then is if the bone graft would even be beneficial if I never get the implant? Won’t that bone reabsorb as well? Btw if age/gender play a role here I am 40 and female. Thank you for any advice.