Bitcoin transactions will definitely increase in the future, there is no question of it being silent in any way. Bitcoin miners will try hard to complete more transactions with their Bitcoin, so the amount of Bitcoin transactions will increase more in the future but will not decrease.
Logically, with same block size since Segwit upgrade in 2017, Bitcoin blocks will be more filled in future when there will be more Bitcoin users, more demands on on chain Bitcoin transactions in future. I expect to see future upgrades on Bitcoin scalability and block size will become bigger so that Bitcoin blockchain and blocks will be able to serve more transactions per block.
Before 2140, there will be a lot of mystery in Bitcoin transactions and this will determine the type of income of miners on transaction fees. If there are no transactions, then their income will decrease completely, so they will be in difficulty, but their transaction volume will continue to grow in huge size and there will be enough opportunity to compensate them from this.
Because they will then receive the most and largest orders in their blocks than the desired amount of reward than now.
Bitcoin blockchain is lively if there are Bitcoin miners that provide hashrate as computational power to find new blocks including confirm Bitcoin transactions, and Bitcoin nodes (full nodes, prune nodes) to verify and pass it to other nodes.
Income of Bitcoin miners, if people understand correctly, is from two sources: Bitcoin block rewards that is halved every 210,000 blocks, and Bitcoin transaction fees by confirming Bitcoin transactions for Bitcoin users together with new blocks found.