How do you figure? If Bitcoin goes x30 and fees go x30... all the ratios are the same.
There also has to be some different mindsets to it that might make it not linear.
We saw how people acted when Bitcoin had $50 fees.
I have to imagine that the way people act around $500 would be even more intense.
Just the thought of "wasting" $500 will make a lot of users not want to transfer their Bitcoin (even if it's $50,000 to the exchanges and that's only a 1% fee). It would be fully possible to imagine Bitcoin spiking from low liquidity just because the fees are so high and the exchanges run out of supply. This of course would send the price and fees of Bitcoin even higher, ironically. Then everyone who held feels like they got rewarded for holding and even more people want to hold... it could get crazy.