Exactly. You and I won't be able to live by the time all Bitcoins are mined on the network. Increasing the max supply is more of a future concern than anything else. In case prices remain the same or go down the drain, developers will need to find a solution in order to maintain miners on the Blockchain. Since rewards will be paid solely off fees, miners will depend heavily on Bitcoin's price on the market. If development continues, I'd expect people to use "satoshis" via the Lightning Network for mainstream payments in the long term. By 2100, future generations might be dealing with very small fractions of a Bitcoin that are worth cents (in USD). Based on my calculations, there will be a total of 21 quadrillion "satoshis" on the network. I think that increasing BTC's max supply could make matters worse as it could devaluate the cryptocurrency on the market.
Nonetheless, there are far more important things to focus on making Bitcoin a better cryptocurrency for all. Increasing the supply is not mandatory for Bitcoin's mainstream adoption. Putting scalability and decentralization above all else, could allow Bitcoin to survive far beyond 2100. At least, we don't need to worry about Bitcoin reaching its maximum supply in our lifetimes. There's plenty of "room" for everyone with Bitcoin's current hard cap in supply. Just my thoughts