I don't think so, NIP-05 just makes it easy for a human to find you and make sure it's actually you. Someone could generate another Nostr npub that has the same 5 characters as your original one, without NIP-05 you'd have to compare the rest of the npub just like you do today.

Also the only way to generate the stupid things is by brute force, but there's nothing stopping a client dev from adding that ability into the client sign-up. It would delay the process by however long it takes to strike one and it doesn't really solve anything, but it looks cool.