The destruction to the Founder's political vision didn't come from expanding the franchise, it came direct democracy. The idea was explicitly that the average voter was completely unqualified to choose the President, and that the only question the voter would be asked is: "Who in your town should make decisions for you?" That person would go to your state legislature, which would vote for your state's electors, who would go and deliberatively decide the President. With the 17th Amendment and binding primary elections we threw out that wisdom.