Bitcoin was not designed to be a high-throughput currency. It's a store of value.
You put your money in it and let it sit. That's it.
If you don't want to do that, don't use it. But that's what it's for. Or at least what it's evolved into.
I think it can cause a gigantic speculative bubble that will put people like Thiel in control over even more wealth in the world than they already have – if BTC goes to $1M/coin, what do you think will happen? $10M? There's no upper limit.
But that's a separate issue.
Bitcoin doesn't have to do anything except what it was designed to do. And it was designed this way. Satoshi certainly thought through this scenario and specifically decided to do this, and not something else. So those who are putting money into BTC are betting on Satoshi's original vision.
Now, do you think Satoshi really believed BTC would be the only crypto? I think he knew others would spring up. He solved the byzantine generals problem with sybil resistance. Of course he knew others could solve it too, in slightly different ways.
So I think he just said "Well, let them do that." And hence, use different cryptos for different circumstances.