Aren't we in the USA already at >200 electoral votes total that have pledged to put all of their votes towards whoever wins the popular vote? That said, I would expect a more serious resistance as it inches closer to where it might actually make a difference.
Also, I realize that isn't quite the same thing as fully moving away from a first past the vote system, but it is a type of reformation and it does help get away from the electoral college system in particular, so seems somewhat related.
So far... this time could legit be different.
We've Fucked Around with the planet (since the Industrial Revolution), and also invented nukes, so... I suppose we're about to enter the And Find Out stage of FAAFO.