As far as a currency or store of wealth, Bitcoin is shit. Satoshi was/were an idealist(s), and for them it wasn't about the money, it was about the idea. Decentralized proof of concept that anyone on the internet can access and can't be censored without extreme global geopolitical cooperation. They chose to make it like a currency (Bitcoin) for adoption purposes, but the mathematical and technical concepts behind it can be used for any transfer of information that needs to be reliable, proven (signed), and decentralized, which makes it ideal for some things we are already using, and concepts we can't even imagine yet.

The idea sparked other blockchain concepts such as Monero which is actually designed to be used, like digital cash with tiny fee of pennies, not as a store of wealth or prospecting. It is essentially anonymous as the sender, receiver, and amount are never known except to those with access to the wallets.

Smart contracts still have a long way to go but have some very interesting uses as well.

Why does being around in 100 years matter for Bitcoin, though? It's unlikely that Bitcoin will even be around in 100 years and Satoshi likely knew that or would have made the halving rates longer. Last halving was 2020. In about a month (next halving) block rewards will be halved from 6.25 BTC to 3.125 BTC, which puts upward pressure on miners to innovate (find new ways of reducing energy consumption and increasing hashing power), increasing scarcity, and, historically, increasing price.