> The same can be said in this country with the absurdly low unemployment rate in North Dakota while the disability rate has shot through the roof. Unless you think people have suddenly and inexplicably become disabled this is clear evidence that people are willing to go on the Government dole rather than get a job in North Dakota.

Or, people who are able-bodied and unemployed have chosen to move out of North Dakota (perhaps due to work available elsewhere), and/or people who are disabled have chosen to move to North Dakota for financial or environmental or other reasons. Either of these would both reduce the rate of unemployment and increase the rate of disability without people "choosing to go on the Government dole".

> The question is: how many people currently working would stop working if they didn't need to?

The price consequences of BI are such that this is self-limiting. Once you set a level of BI, the more people choose to opt out of work, the less affordable it is for people to choose to opt out of work. Less people working -> higher market clearing cost of labor -> higher market clearing cost of all goods and services -> reduced standard of living for people on fixed incomes (including whatever point the BI is set at.)