Some of it will take care of itself. You can only veg on the couch so long before you die from otherwise preventable disease.
The percentage affected may be smaller than it seems. Some want to veg and watch sports all weekend because they were forced to bust their as all week in a job they hate. Take away the job (and the need for the job) and they might get more active in their free time. The unemployed who sit and veg mostly have no money to do anything and have lost hope in getting a job.
Though I'm sure there are some di-hards that reallywould sit on the couch until they de-compensate and die. But that is a choice they make and it would solve the problem.