> Do you think bitcoin will gain in value from this point on or do you think bitcoin will fizzle out, and why do you think that?
If I knew the answer to that, I'd be off making money rather than arguing with random strangers on the Internet :-)
Gold and silver have valid (if limited) practical utility and thousands of years of history as stores of value. Bitcoin has neither. And gold and silver only became synonymous with money and value once they began to be used in coinage i.e. as a currency, issued by the state, and you could pay taxes with it.
Your thesis is "Bitcoin is a good investment because it appreciates". It doesn't answer "why does Bitcoin appreciate?". Practically everything that can be called an "investment" or "asset" has at least one of two properties:
1. has practical use
2. generates income
Say all you want about investors buying up houses and driving up prices (and the Bay Area's housing problems run deeper than that), but they're getting an asset that has actual value. Even if people stop believing in the value of houses, a house will still shelter you, and afford access to good jobs and/or surroundings/weather.
I'll grant you that Bitcoin has one property that can't be found anywhere else. It's a store of value that can be exchanged without intermediaries. So it has exactly one practical use.
But the point of a store of value is to...store value. The idea that "someone will pay more for this later" has been the basis of innumerable bubbles and crashes throughout history - as recently as the Great Recession to as far back as the Tulip Mania, and probably farther still. Volatility isn't a great property for a store of value to have, because most people don't like crazy gyrations in their net worth every day.
And if Bitcoin isn't a store of value, but is a currency instead, then it has a different problem. As you said, it's non-inflationary. So people are incentivized to hang onto it rather than spending it.
> Looking back obviously there would have been no better place to put it than into bitcoin but nobody knew that back then.
Past performance is no predictor of future performance. Someone putting a million dollars into Bitcoin in 2017 would be pretty sad right now. People believe in the stock market, not (just) because of its past performance, but because it represents companies that deliver actual, real-world value.