What you describe is exactly the current situation in Europe, but the reason is not some bohemien ideal. The reason is fear. By tieing entitlements to a lot of conditions people are incentivised to stay put in their current status once it is officially acknowledged. Once you have your piece of paper that makes you unfit for work you avoid doing anything that could threaten that hard won status. I personally know people who live off benefits but would much rather work if they were not threatened with losing _all_ of their benefits the day they start to take up self-employed work.
An interesting question is whether government employees and large government contractors count as dependents for representation purposes or not. Some of the same tight-feedback-driving-increased-benefits-without-regard-for-true-value loops that are of concern in the generous-welfare case are also at play with regard to civil servants and large companies wholly dependent on government spending.
More practically, it removes the poor as a voice in their own governance by using what amounts to a bribe. And in practice, it would probably remove most poor people from the voting rolls, because short-term, taking the 10k or whatever to make ends meet is the rational decision over pulling a lever that may or may not have any affect on your particular situation.
I think my main objection here is that there is no real guarantee that the extra money, generally, will push people out of poverty and back into enfranchisement -- and if it doesn't work, what you've done is institutionalize bribery and legitimize an explicit oligarchy of the rich.
Besides that, Canada already has rules in place that deny full welfare benefits to recent immigrants.
That said, most immigrants to Sweden do seem interested in working -- there just seems to be a strange glut of uneducated people, compared to the available jobs.
(Remember, it is a welfare state -- high minimum wages.)
Educated people that can choose country prefer places with lower taxes -- which are high in Sweden to pay for the welfare state.
Edit: The real problem is that Sweden might be on the way to ghettos, US-style in a few decades. :-( A sociologist might mutter something about a perfect storm to generate a criminal underclass, also US-style. :-(
Edit 2: Worst case, I could go to Canada... Would love to relearn my French, anyway. :-)
For example, the first generation to enjoy such a guaranteed minimum income might still have the traditional ambitions... but over time and with practice, the bohemian ideal of making-do on just the guarantee could grow in attractiveness. And, the discretionaty time offered by the stipend could be directed chiefly at lobbying/politicking/mass-protesting for ever-larger benefits. After a few generations, might we get a combination of the worst stereotypical qualities of both the 'underclass' and 'trust-funders'?
It's the sort of positive-feedback loop that -- like financial leverage tricks and other forms of moral hazard -- can build on itself until disasterous collapse.