Bitcoin's idea is to use Lightning Network to keep the extreme majority of transactions from ever having to hit the blockchain. And it's also why the blocksize shouldn't be increased like some forks are doing, because in 100 years (or even 5 years) the size will be unmanageable.
I believe ETH has something similar, but I'm not knowledgeable enough about that ecosystem to say either way.
It's clear to everyone that the blockchain as a "data structure" isn't scalable to anything resembling "widespread usage", and that it will be a hard requirement to figure out how to either quickly and safely "prune" information from a blockchain, or get most of the transactions to stay off of it somehow.
Also, I'm sad that most of the replies to your comment are jokes or comments about how it won't matter, or how you are dumb for even asking the question. It seems when it comes to cryptocurrencies HN is just as bad as other forums online that everyone resorts to insults and "witty" one liners.