While this is a really stupid idea (letting the popular majority vote in the country determine your state's electoral votes -- potentially to be the opposite of the will of the voters of your state), there is nothing unconstitutional about it.
If the state legislature were to pass legislation that used the results of the Super Bowl in the election year to determine the state's electoral votes, that would be fine by the Constitution. The Constitution clearly gives the states the right to determine their electors however the state legislature decides.
Still, it is a demonstrably STUPID idea to turn the decision over to the rest of the country.
I like that idea better --- GOP gets the AFC. Dems get the NFC.