It sounded like they required support from the developer community but they didn't have it. Not sure if that support would be needed for a 51% attack, would it?
"Compliance measures on crypto-currency are expensive. We'll be charging a 3% compliance tax on all crypto-currency holdings, and we'll do this via any US-registered crypto-brokers charging a withholding tax unless you can prove it's double-taxation; also any failure to pay this is tax evasion and will be prosecuted as such"
you'll see some hard forks. Also this is a _great_ idea as it increases tax revenue, increases investment in US bonds and stocks, _and_ it suddenly swells the value of US Govt gold reserves.