Ethanol problems in classic cars

I ran across this video on ethanol problems in classic cars:

[ame="https://www.youtube.com/watch?v=ZtqWT8ZfG5Y"]HVA: Ethanol in classic car engines.mov - YouTube[/ame]

A lot of people here have been having excessive problems with carburetors, fuel pumps leaking gas into the oil, corroded gas tanks, and such. Could ethanol be the culprit? I plan EFI eventually for all my cars, which isn't affected, other than the possible gas tank problems, and maybe new tanks are immune.