People can still become a black market escrow, keep creating new merchants and facilitate user to user transactions unless there is some kind of cost or identification required to accept Taler payments, or exchange Taler for bitcoin. US law makers will likely try to prohibit Taler though if any online gambling accepts it as payment, for example Paysafecard had to design a special UIGEA compliant card in order for it not to be able to be plugged into a gambling site to get into the US payments market.
Speaking of bitcoin pretty much every online exchange will start accepting Taler, then they aren't so exposed to banks shutting them down and can trade in any currency.