Just looking at the past at what the ratio has done it seems clear that over the long term Silver could be a better bet than gold (if that is you would like more gold). There seems to be a rough 4/5 year cycle to the ratio.
It seems likely that between 55-60 by some point in 2018. Perhaps even as low as 48 by 2019.
The only way we will hit the 30s if we see another nutzo bubble in the precious metals. In which case you should probably be selling your metals for worthless fiat.