I realize your post is months-old, but it's on the money.  Metals are investments at this point, and they're not really good ones at that.  People say they're a hedge against inflation, but as with everything else, it depends on the price you bought them at.  There are people who bought silver in 2011-12 who are still waiting for the lifeboat to arrive so they can get out from under water.  Even if you bought gold or silver now, it's quite possible that in 5 or 10 years the price could be much lower.

The unlimited aspect of crypto has turned a lot of investors off, I think.  There was a big finance guy--I can't remember who, maybe Buffett--who said basically what OP said.  Bitcoin is finite, but there's nothing stopping anyone from making their own coin, and they are.  In great numbers, no less.  There's got to be a limit at some point, I would think, because computing power, electricity, and interest keep people from mining every coin in existence. 

And if you look at the dead coins on yobit, it's already clear that most coins lose their appeal to people pretty early on.  There's just no need for them, and it takes interest in them to keep them alive--which is why I think bitcoin and a few others are viable long-term.  They have the community and the interest to keep their blockchains alive.