I would love to just be able to store my holy wallet.dat file away for many years and be able to re-gain access to my wallet using this file, primarily through other wallets too if Bitcoin Core wallet seizes to exist by then.
For long-term storage, you may want to consider creating a cold wallet: install Bitcoin Core on a fresh system that hasn't touched the internet, create your wallet, set a password, create several backups of your wallet.dat (on storage devices from different brands), and thoroughly wipe and reinstall your computer before it goes online. Or just keep a spare laptop dedicated to your offline Bitcoin Core, so you can easily get new deposit addresses in the future.