Reduction in Block Rewards: Every four years, the reward for mining a block of transactions is halved, reducing the number of new bitcoins introduced into the system. This means that the profitability of mining based on block rewards will decrease over time. Currently, miners are incentivized by both block rewards and transaction fees, but as block rewards diminish, transaction fees will become the primary source of income for miners.

Transaction Fees: After all bitcoins are mined, miners will rely solely on transaction fees to sustain their operations. This shift has led some to speculate about the future viability of mining, but many believe that if Bitcoin's adoption and use increase, so too will the transaction volume, potentially leading to higher fees that could make mining profitable.

Technological and Economic Adjustments: The mining landscape might evolve with advancements in technology, changes in energy costs, and broader adoption of Bitcoin. Miners might diversify into other areas like AI or renewable energy, or new protocols and layers could increase network activity, thus boosting transaction fees.

Network Security: The security of the Bitcoin network post-mining of all coins depends on miners' willingness to continue validating transactions for fees alone. If transaction fees do not provide enough incentive, there could be concerns about network security, though the expectation is that the network will adapt to ensure miners' participation.

Long-Term Perspective: While the exact longevity and form of Bitcoin mining beyond the mining of all coins are uncertain, the community anticipates that Bitcoin's ecosystem will find ways to adapt. The significant time frame before this happens (over 100 years) suggests that numerous technological, economic, and perhaps regulatory changes could occur, influencing mining's future.

In summary, while the traditional form of Bitcoin mining with block rewards will not last indefinitely, the activity of mining itself is expected to persist as long as there are transactions to validate on the Bitcoin network, driven by transaction fees. However, the exact nature, profitability, and scale of mining in the distant future remain speculative and depend on various factors, including Bitcoin's adoption rate and technological advancements.