I'm not sure what a good percentage is but I know the majority of the population is self-motivated. What that motivation is can very greatly and is affected by resources. I've sat on my ass plenty of times and watched TV simply because I didn't have the money to go anywhere.

Will there people who abuse that goodwill? There is in almost every system. Just like you can't design the perfect lock to keep all thieves out and still be useful you can't design a UBI where everyone is going to use the money as we judge best.

A new New Deal I think should cover more than just infrastructure. There are public works of art that we have now that would not exist if not for the fact that some administrator in the New Deal era thought having artwork was also important.