eh, it's not a terrible idea. But it definitely shouldn't be "universal". Only have people below a certain financial threshold eligible for it. I specifcally say "financial threshold" rather than income so that those that have inherited vast fortunes don't get extra money that they don't need and it is solely for those that would actually benefit from it.
That said I think it would be much better to spend the money from this on different things instead. ie. free healthcare, sick pay, parental leave pay etc.