I think cash will be around for a while too. We've seen banks and financial platforms experience outages of hacks. It makes sense to carry a little cash just in case. Even bitcoin requires (well, pretty much) an internet connection. And sometimes the internet goes down.
Right, internet is a bottleneck in the case of BTC.
A few, less than perfect, alternatives:
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For big transactions the Internet will be there in one way or another. Fur smaller transactions lightning may or may not work. Accounting systems would come into play for trust issues and then settlement when the chain is available.
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