We have transactions fees, to avoid creating tons of transactions and increase the blockchain size to a extreme amount.
Those transactions fees are sent to the next user who is the miner.
How would the economy of a coin would change if instead of sending the transaction fee to be mined, the transaction fee was frozen and 1 year after it it would be sent back to the wallet. The user wont lose that money, but still can't keep making tons and tons of transactions to spam the blockchain.
Imagine yourself as a miner then would you support this idea?
How can you expect someone to invest their money and time with no real rewards for themselves and crypto market becomes already a profitable investment so don't expect enthusiasts to invest with no expectations.