Are you assuming the chain does nothing else at the time? And that fees wouldn't explode the second people actually tried to use it, and block space would dry up? Seems like using only the free portion of block space would allow you to arrive at a more realistic conclusion. Blocks seem to be going out pretty full thanks to ordinals.
I expect lightning adoption (to the extent it happens) to take place over decades, not just 1.45 years, so there's plenty of buffer already.
In the past, fees have at times been both lower than today and higher than today. That will be true in the future too. Satoshi Dice didn't ruin bitcoin in 2013, and neither will ordinals in 2023.
