I think you're confusing whether or not something is 'real' with whether or not something will hold value in 5,000 years. If you're able to ascertain a wallet

I think you're confusing whether or not something is 'real' with whether or not something will hold value in 5,000 years. If you're able to ascertain a wallet private key 5,000 years from now, it'll still be as 'real' as it is at this moment. Just maybe not as useful/functional or valuable. Well... unless in 5,000 years there is a crypto museum out there willing to pay significant sums for anyone who can produce a valid private key for an address that once had a transaction on the blockchain.