I think a basic income can create very strong incentives to make at least some additional money compared to traditional social security. There is no need to find a job that pays at least $1300 in order to make it worthwhile, for one (you get to keep your basic income no matter how much you make – minus taxes, so this is in a way not always true).
I would even think that something like a basic income is especially nice if you want to become self-employed.
(There would be higher taxes, probably much higher in the US, a little higher in Europe, but I – being one of those liberal Europeans – have no problem with that.)
I’m still kind of on the fence when it comes to basic income, though. I think finding the right way to do it (how to pay for it, how to organize it, what kinds of social security systems to slim down or abolish, etc. etc.) would be very hard indeed.
$1200 what? You're missing a time element there. I assume "per month". I've lived on less than that before, with some comfort, and I was working, too! If I get to assume health care (not unreasonable in the world we're hypothesizing) and don't forget that I'm not working and I'm not worrying about working either, then yeah, that sounds like a pretty good deal for a single guy with no family.
And by the time we kick this into gear, society may well be able to afford more than that. We're not talking today's society (which already has unsustainable levels of social obligation), we're talking a 20-30 year minimum future society. Or at least I am, since I'm actually talking about the real possibility, not a hypothetical parallel universe where it exists today.