Disenfranchisement is hardly the only reason to jettison the EC, and I'm not sure it would disenfranchise more. As it stands now everybody in, say, California or Texas is disenfranchised before the vote even starts, and then once the vote is in, half or often more than half the rest of the voters go to the shredder as well.
One of its big flaws is that it suppresses voter turnout in general. Nobody in the aforementioned 'Red" or "Blue" state has any reason to vote at all, as that state's vote is predetermined. They can go vote with their state, vote against their state, vote for a third party, or stay home and bake cookies and every scenario returns exactly the same result with the exception that in the last one you get cookies.
That's a major reason our voter turnout is embarrassing. In 2016, a more typical year than the last round, turnout was 55%. That's absurd.