These sort of pensions are already available to some people, in some countries (typically the elderly and the disabled). However governments are struggling to pay for them, and the eligibility criteria tend to get tightened (in my country, the old-age pension age will increase to 67). I don't see how they could be expanded to the entire population without destroying the governments' budget, and if they tried to raise such massive sums through taxation, destroying the economy too (and causing massive flight of the wealthy to lower-taxing countries.)
The availability of BIG to people who don't actually need it is about the principle of BIG: that it doesn't care who you are. I'd find it interesting to consider how we might let people decline their BIG stipend in return for... something.
> I'd find it interesting to consider how we might let people decline their BIG stipend in return for... something.
Why would we do that? We could instead just sell the
"something", which has the same effect, without defeating the point of BIG by complicating the BIG administration.