this is the cricket approach. baseball typically plays multi-game series instead.
i agree in spirit though. i have long thought it would make sense to abolish the playoffs. give the pennants to the teams with the best records. then, have them play a 21-game World Series in the fall.
yeah, they never had 21 games, but the winningest team from each league played in the World Series until 1969. They did have a few 9 game World Series, but most were 7.