I believe the problem lies in where exactly do you get the money for BI? Who pays to provide it for millions of people - obviously you can't tax the BI itself, so what's left is the rich and corporations, which incidentally are the ruling class at the moment and will most likely oppose BI.

Also, health care will still need to be covered separately.

BI is a great concept, and I hope some country will make it work, but it's not going to be the US, that's for sure.