This line of debate is a trap because someone can always trip you up with what ifs and nitpicking about the logistics of any particular system you might propose.
Stick to the principle. The advantage of a gold standard would be nothing more or less than that it would end a monopoly on money creation and thereby put restraints on corruption and mismanagement associated with our current money system.
The real answer to the money question is let the market work and see what emerges. I always say, I agree, gold may be impractical. Anything anyone can name might be impractical, but after many thousands of experiments the market will discover the option that is ideally suited to available technology and resources.
Ron Paul shifted to exactly this answer too, which is why these days he advocates competing currencies, and not just gold.