Haha, can not dispute this fact actually, but let's face this fact as well, the average man is very crazy, and can do really crazy things, all for what? All for nothing.
For starters, the craziness will stop the moment you try to turn on a 5360W machine running at 380V in your average home.
The only barriers or limitations most people have is money, when they don't have the money, then they are as cool as iced water.
11,725 $/Unit is enough of a barrier?
And let me also point out that maybe I didn't phrase what I actually meant correctly, which I apologize for...
When I said billions competing, what I actually meant was that, billions are gonna be competing in both ways, that is, those who have the money will sure be squandering some of that money to gain the experience of what mining bitcoin feels like,
No need to spend thousands to see how it feels, you can go do your average car wash and stand there in the noise for a few hours, then to your street bakery to sweat in 60C and back home and watch how your computer progresses with folt@home cause there is really no difference. And you can do all this for $5 instead of 10k. Mining is not something that suddenly will become cool or anything else, it's driven by the pure economy, you either make money or you don't, that's why I dropped most of my miners and kept just a pair because it doesn't make sense, I could simply buy coins instead of wasting money on electricity with zero returns.
You see billions flooding California to get the last gold nugget that might be hidden somewhere in some riverbed?

With powerful computer and processing power and the quantum computer that has been a topic for gossip is going to make Bitcoin mining faster. I don't think the 7% of Bitcoin mining will take a hundred years. It could be over in 10 to 20 years. The reward is going to become half after certain numbers of block has been mined. And I don't think it will take 4 years like it is taking right now. Maybe we can witness all Bitcoin get mined.
You do know we have a thing called difficulty adjustment right?
So even if by tomorrow you would find a machine that mises coins one quadrillion times faster all that will happen is it won't be 100 years, it will be 99 years and 50 weeks.