If your channels are draining that fast you probably have low fees. If you have higher fees, you'll get more transactions of lower value.
A unidirectional channel can handle essentially any number of transactions, down to whatever is the capacity / the minimum transaction value (usually 1 sat). How many happen in practice depends on fees.
That makes sense but it's usually a static number like 10 or 100, especially if it's a small channel. What I'm saying is that these are not sustainable if we have to close them.
LN seems like economically requires people who hold a large number of BTC to make big enough channels that can counteract the price of expensive on-chain TXs. If Bitcoin's future is only full of people with small amounts of BTC and all on-chain TXs are extremely expensive, I don't see how everyone can participate economically.
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