so that means things will change somehow before we get to 2140, otherwise the value of BTC will be in effect capped to 182 satoshis being equivalent to the smallest individual item one can buy (so maybe the price of a single nail in a hardware store? something like that)
No one buys a single nail, they're either sold in small packs of a bunch of them, or by weight. Any single item that is too cheap to be less than 1 sat will get bundled up in quantities that allow it to be conveniently bought, or there is some sort of other accounting system in place, (something off-chain like a credit system or account balance or something).
Rice is sold in bags. The smallest retail quantity I've seen is maybe 1 cup of rice. Liquids are sold in bottles or cartons or jars.
It's unlikely we will see anything smaller than 1 sat even if divisibility becomes an issue. Or I could be wrong, but still a hundred years to go before we find out.
The surviving altcoins will provide liquidity for small ticket items, but the existence of those very same altcoins will be volatile.