Most of investors will keep buying ethereum no matter the transaction fee of blockchain. Some correction will be made like user transaction transparent that cause many private hacks. Rest of holders will either sell or buy like investor. Popularity of ethereum blockchain will significaly grow reason be is fix for cost of fee to set up like it use to be very low no matter the price or ethereum. Because when ethereum grow value immeditately cost of fee goes enormous up. Fee should not depend it cost for ethereum price, it should be stable with no change.