It would also mean teams losing revenue for the games taken out of the schedule, which I don't see the owners standing for.
Going into November wouldn't be such a problem if only the teams from the Sun Belt were getting to the World Series.
I don't imagine a Brewers vs. Tigers Series would be a whole lot of fun.
Now if the Padres could fashion a record to match the Yankees of the 1949 to 1964 era, half the World Series games would be in a warm climate at least.