The price of one bitcoin is arbitrary. $1 is no more crazy than $1 million. It's all crazy. But the question is, what's the supply and what's the demand.

At some point there will be a correction. This velocity can't be maintained forever. But this is also a technology that heavily relies on going viral to become functional (payments/contracts) - and based on real world interactions I think crypto is heading towards an adoption curve that justifies its price.

Bitcoin can never achieve mainstream adoption since the transaction throughput is capped at 3 per second.

Maybe other technologies will, but Bitcoin cannot.

This is incorrect. Firstly, it's 10 per second. Secondly, it shouldn't be all that hard to imagine "side chains" or even "local-party networks" being built to handle transactions and use the underlying blockchain as a settlement mechanism. This is, as I understand it, how the lightning network works/will work, and I see no reason to think it wouldn't improve Bitcoin's adoption, which is already orders of magnitude better than other cryptos.

>Croman, Kyle; Eyal, Ittay (2016). "On Scaling Decentralized Blockchains" (PDF). doi:10.1007/978-3-662-53357-4_8. Retrieved December 10, 2017. The maximum throughput is the maximum rate at which the blockchain can confirm transactions. Today, Bitcoin’s maximum throughput is 3.3–7 transactions/sec [1].

1. http://www.comp.nus.edu.sg/~prateeks/papers/Bitcoin-scaling....

I’d be interested in seeing evidence that USDT “drives” the USD-BTC exchange rate. I do think it’s a good indicator of sentiment about the exchange rate. Typically it’s within $0.02 of its supposed $1.00 value, but today it reached at least $1.08 and is still at $1.06. That means people are willing to pay a 6% premium just to be able to cash out of BTC today.

Maybe USDT is used in cross exchange arbitrage, where USD would be a lot slower and thus not worth as much.