Aliblaba, agree I don't think gold ever will fall in value relative to any currency.
Europe and USA hold about 70% of central bank gold reserves with Asia only 6% (2004). I think countries like China and others will try to extend their gold holdings. Sure some ideological politician may propose for the good of 'mankind' to sell gold to raise some cash to give away, but I don't think so.
The perfect thing about gold is that nothing can replace it as a store of value. Silver and platinum just do not cut it, and diamonds can't be remelted or easily get a fixed weight or value. Houses rot, cars rusts nothing has long term secure value like gold. Silver may be a useful coin but its value will then be related to gold.
Even long before electricity and the printing press, gold had value. Easily transported, easily recognized and easily traded.