Unfortunately deflation is the end game, in a best case scenario. Sudden or prolonged death are the other options. Carrying 100's of pounds isn't sustainable.
Fallout starts around the mid 30's. By the early 40's, one of the paths is well underway. I encourage young men to seriously consider marrying into the fetish. The prime years are 18-35. With marriage happening later these days, it buys only a short window of additional ssbbw fun time. Then you are either a caretaker or a with a deflated partner.
Most people in a medical state to require caretaking aren't very happy. Doting on an angry or depressed person gets old fast.