I think its still doable outside of urban areas, it would just be all online. the major metals distributers accept BTC for purchase. So about a week to recieve delivery, then you have to lock in a price and mail it back to sell bc they also buy.

The only pit fall is the premium you pay for purchase and for rural folk, the shipping. But overall, if youre trading btc and making a lot of money on it, then who cares if you have to pay about a dollar premium per ounce if you're dodging the IRS significant percentage of tax.