It would very likely bankrupt the entire planet,
If you're talking monetary, that's really impossible. Wealth is distributed, it can't really be destroyed. Speculation (stock market) is the only way that's loosely considered to be able to "create" or "destroy" wealth. It would be a significant contributor to global inflation though, as material and labor were effectively siphoned out of the economy.
Not that there'd be anybody to foreclose or any collateral to be forfeited, but yeah, should the commitment be made, the ongoing cost of the project could very easily exceed the ability of the entire world to pay for it, and that would result in far worse consequences than mere inflation.
They'd have to invent a new word that transcends traditional bankruptcy, but in the meantime, it'll have to do.
Edit: But if NASA'a also closing in on anti-gravity, I take it all back.
