As much as we love to move on from gold and other precious metals, we can't. Governments are heavily committed with these stones and are also heavily invested to it that they simply wouldn't let it die. Also, a market once robust that gone silent has a big potential to be one of the most bullish market again, especially gold and silver with large backings all over the globe. People would still stick into something they're accustomed to until the point where innovation introduces them to new benefits that they weren't getting from their previous items/services/etc
This right here is key to note, and it has its pros and cons with government involvement.
The biggest pro is put forward by you, that government wont let the commodity due as they have a vested interest in the price of it being higher as they own it as well and want the price to be as high as possible. Plus they're not going to be buying more of it, so they don't want the price to go lower (if they were buying more though, they would want the price to dip around the times they purchase, but this isn't the case)
But here is the biggest Con, a lot of your investment is heavily at the whim of government(s) as if they really wanted to, they could just sell a ton of their precious metals and that would throw a lot of supply into a marketplace with no demand increase. This would cripple your investment.
I wouldn't get involved with precious metals.
