I'd preserve the AL and NL because of tradition and DH non-proliferation. The argument that realigning everyone is OK because two teams in the 100+ year history of the two leagues have done it is ridiculous. But, if we had to do it: NE: BOS, NYY, NYM, TOR, PIT, CLE, DET, MON SE: PHI, WAS, BAL, ATL, MIA, TBR, CIN, STL Cow Country: CHC, CHW, KCR, MIN, MIL, TEX, HOU, DEN West (we're all in agreement here): POR, SEA, ANA, LAD, SDP, SFG, OAK, ARI Although Montreal is much further from Detroit than it is from Philadelphia, Baltimore, or DC, preserving time zones to the greatest degree possible is a worthwhile goal. And this would get me 6 Met games a year at the Jake, another worthwhile goal. The only time zone oddballs you get here are St. Louis in the southeast division and Denver - the only MLB team on mountain time* - in Cow Country. *Arizona is also technically on mountain time, but doesn't observe daylight savings time, so they're effectively Pacific during the baseball season.