Hi Mr Fish Rickards saying or guessing them that be would confiscate the gold by such and such a date is moreso a political guess rather than proper economics.
Admittedly it has happened before and we had restrictions on gold trading as late as 1980 in Australia, but bullion in general is far too wide spread now for them to be able to do it now, controls they could try but IMHO they would not be successful
100% digital will also fail IMHO
IMHO the only way that Trump can overcome the debt and make the US dollar recover (in the short term)is by a gold or silver backed currency
His problem is overcoming his ties with banks and big money who would oppose such a move