If BTC become fees $100 or more for each onchain tx, the merchants will need to pay $100 in fees onchain for withdraw and they'll lose money in sales. That's why they'll keep their money in the LN network forever.
I doubt that people or businesses will ever keep their money in LN "forever".
It's a farce and every human being with at least 1 healthy braincell will reject this fucking idiocy.