Of course, that would take nothing less than a constitutional amendment, and there are way too many people who take advantage of the system that would be unwilling to risk losing any perceived advantage to let it go easily.  And to what end, then?  Parlimentary systems such as a  common in Europe are easily just as easily screwed with.  A direct vote would actually be worse for voter fraud in the US than is common today, and a great many people would still agree with the original reasons for having an electoral college, namely as a means for the political class to insure against an ignorant electorate making a horrible choice.