I think economy is not his strongest part. Basic income will become new zero if it was ever introduced effectively rendering it useless. Maybe he should read about Musa I of Mali?
I think if robots will take all the jobs, what these robots will produce will be extremely cheap, perhaps even free.
Just because everyone has the same amount doesn't mean that everyone has an infinite amount. It's still a scarce resource.
No, no, Elon: you need to phrase it as a threat.
"You need to institute universal basic income, because I am building robots to take all your jobs."
If it were actually threatening, it's easier to just stop him before he acted on it.
Sabotaging a billionaire's agenda isn't that easy, really.