Basically I have a 3 wave system.
Wave 1 - Targets ages 65+, as this is the fastest growing age group from 2000 - 2010, and I am working towards making Social Security more stable (or maybe unnecessary) this is the largest wave of injections. Looking right now at somewhere around 90% participation.
Wave 2 - Targets ages 18-64. In order to reduce strains on resources and open positions in the job market I am looking at taking the unemployment rate, doubling it or tripling it, and using that as a basis for participation of this age group. I still need to do more research before finalizing it.
Wave 3 - Voluntary participation phase. This is where I take the ideas with the lottery system from Sliders and put it to use. Setting an amount that when withdrawn enters you into the lottery will be important. It can't be so low that people won't bother but also not so high that people can pull out thousands and break the economy without "risk" of participation.
The system will have some restrictions like a draft would for the mandatory phases, things like 1 surviving male in each family, children can not have both parents participate, etc etc. Considering employing some kind of system where participants survivors receive some sort of temporary subsidy if a provider for the family is selected.