I think the primary reason for going onto the gold standard has to be to neutralise the debt. A gold standard would suit the US to effectively eliminate the debt, it would suit China and Russia because they are now major holders of gold and on a level with the US. It would be a great equaliser even though inflation would be terrible in the US.
Unfortunately due to Gordon Brown, that would leave the UK in a less than bad position. Maybe there will be a sharing a gold amongst the EU, US, Russia, China and the Commonwealth? But I think that's a long shot - I can't see Australia and New Zealand 'sharing' their gold with the UK!!