Frankly, I was more optimistic about Bitcoin before I knew the technical details.
What I heard back in 2009 was that it was a way to trade money using cryptographic hashes without a central authority. I didn't really think about it more deeply than that. I didn't bother setting up a wallet or anything like that as I didn't have any extra cash to waste on new technology. But I kept a halfhearted eye on it as an alternate way of making payments over the internet.
When I finally went and looked at the mechanisms and the algorithm I thought "wow this is a bad joke." It's inherently deflationary and will never be an accepted currency outside a narrow niche of (mostly illicit) users. It's price relative to USD will always be volatile due to its astronomically high gini coefficient, and anyone not on the high end of that inverse exponential distribution will _never_ prefer bitcoin over USD. BTC printing mining will eventually cease entirely, meaning the transactions will require transaction fees that scale up depending on the size of the network, which will further discourage adoption until ultimately the whole scheme collapses (the founders having cashed out a long time ago).
Fees are Bitcoin's problem now, and will likely be its biggest problem (along with continued volatility) until the network ceases to function entirely.
https://bitinfocharts.com/comparison/bitcoin-mining_profitab...
There are two interesting points. First, is that early mining was exponentially more lucrative than later mining. Second, is that somewhere around 2014, mining profitability seriously plummeted (this can be seen more easily in logarithmic view). Before 2014, the lowest profitability rate was somewhere around $200/day for 1 THash/s. During 2014, the profitability plummeted and since then has not gone above $4/day per 1THash/s. There was a slight bump in 2017, probably due to the speculative bubble, but profitability still did not go above $3/day.
The point is: everything you might think you know about bitcoin's viability based on how it worked from 2009-2014 doesn't apply from then on. The scarcity and hype led to a speculative bubble, but from my perspective it appears doomed. Whatever niche it might have had on Dark Web black markets will be replaced by some other mechanism. When speculation stops its value will plummet and no longer subsidize mining. Mining will stop, which will make the difficulty easier again, but the reward rate continues to dwindle, forcing miners to require higher transaction fees. If those transaction fees aren't enough to cover the costs of mining, then more miners will stop. And so the block chain network will erode.