What if ether price goes up to more than $2000 dollars..
ETH won't go to 2 thousand without Bitcoin first going to 40. You're talking about something that may never happen because events when a cryptocurrency doubles its ATH aren't something normal.
If you hold ETH and it suddenly goes to 2000 USD you will be rich enough to pay the fee.
I'm pretty sure that in a 6 months, Ethereum couldn't goes 2000 USD. In 6 months definitely we will have Ethereum 2.0. Look at the ripple and BNB transaction cost