As far as I can read, fees are determined by block size. The smaller the block, the larger the fee. If Monero went mainstream and usage increases, the blocks would be larger and the fees smaller.
Thank you for making me research this. I learned something new today ๐
If we're talking magical immortality, as in you can't die, at all. Then the fact that however much enjoyment and experiences you get while the universe still exist, it will be followed by an infinite stretch of nothing after the heat death of the universe.