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As of this moment the amount of *unconfirmed* transactions in the mempool are ~78k and rising. If you want to confirm a transaction quickly you need to spend a lot of satoshis in confirmation incentive fees to jump the line or wait your turn
The current mempool is around 92MB, and with each bitcoin block locked at 1MB it will take many rounds of confirmation to fully confirm all bitcoin transactions. In bitcoin this is just a normal day but in the fiat world this would be a totally untenable situation
The nature of currency as commonly understood is that if you have it you can spend it, but bitcoin simply is not designed this way. In the absence of lots of compute power adding new blocks to the chain, it is easy to get "bitcoin traffic jams" which make it difficult to transact
An interesting thought experiment to close: imagine all bitcoin has been mined. How will anyone transact? If you don't get fresh bitcoin on adding a new block to the chain, why maintain the chain at all? Transaction fees will have to go up, but how much?
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