Here's a pretty thorough explanation of ethanol's effects on fuel systems.
https://www.youtube.com/watch?time_continue=493&v=ATGSBi1kBl0
Short version: Cars form 2012 onward are designed to handle it. Older cars, not so much. But I imagine we'll still be able to choose non ethanol fuel right? Also it could potentially be exported. For instance, Canada's imports have climbed from over 500,000 barrels per month this past February, to almost 900,000 barrels in
July
https://www.eia.gov/dnav/pet/pet_move_expc_a_EPOOXE_EEX_mbbl_m.htm