If Ethereum is a settlement layer, where should we save our ETH?

Just listening to a Bankless'podcast about "Solana vs Ethereum".

During this one, they're talking about Ethereum being a settlement layer for all L2 (https://m.youtube.com/watch?v=Rd_04vVLE-4&t=28m51s).

But I'm wondering: in an ideal future for Ethereum, what would be the better and most popular way to keep your funds safe? Do you think a Layer 2 could provide the same feeling of safety as we have on Ethereum L1 today?