There is indeed mining expiration, not on the Bitcoin network itself but for the Asic miners that we invest thousands of dollars on, since the mining difficulty increases every time it becomes very hard for Asic miners to remain profitable, gone are the days when S9 Asic miners are profitable, they can't do a shit now than to use on other coins that are based on sha-256 algorithm.
I believe the correct term is obsolete when something new technology is replacing it to compete against other miner, I believe expiration has something to do with life shelf.
Asic miner expires but not Bitcoin mining, so miners also need to always think about the future, they must always upgrade their miners after every few years, this is why Bitcoin miners must always mine and hold their Bitcoin, because this is the most profitable mining strategy that I know.
Holding for the long term will make you earn 2x of your normal bitcoin mining profits, the most successful bitcoin miners around the world mines and hold their Bitcoin, today they are the real MVP.
True that, technology become obsolete, if one wants to be in par or have advantage against other miner, they should always upgrade their mining rigs.
Those who hold what they mined not only earn 2x of their normal Bitcoin profit. I believe it is more than that, just think of those miners who hold their mined BTC since the beginning... I bet they had already looking at a hundred thousand times if not million times profit.