In my personal opinion, having a cold wallet is not necessary for less than $ 10,000. The main advantage of trezor one, which is a cold wallet, is its high security.
This wallet gives us a seed that actually someone else can access the wallet with that seed, so it is not a big advantage.
For example, an online wallet like MetaMask is not available without providing a seed. In my opinion, instead of seed, it would be better to contact the original wallet provider to restore the lost wallet and do a full authentication for it. If this were the case, no one would be able to access currencies without having a physical wallet.