Completely agree with San Francisco Giant's starting pitcher, Tim Lincecum: no reason to expand MLB playoffs.
One, the post-season should live and end in October, not stretch into November. The race for the post-season in September and the start of the playoffs are already dwarfed by the start of the NFL each year. A regular season game between the Browns and Seahawks will draw more viewers on a Sunday night telecast than the average World Series game. Throwing in another MLB Wild Card team won't improve ratings. Two, this sounds like a slippery slope: a quest to add a couple more teams each decade, to the point where the MLB matches the amount of teams that make the playoffs from the NFL, NHL, and NBA (over half from basketball, mind you). Three, not sure if you can blame me if I find this to be a suspicious way to keep the Yankees in the post-season annually.
Since this proposal will obviously be decided without any of my input, this is what I would like to see as a fan if additional teams are added to playoff competition: 1) Match-ups and home field based on overall League record, not division standing and 2) Post-Season begins no earlier than October 1 and ends by Halloween. November baseball leads to delays caused by snow and freezing rain. And, honestly, for a season that begins in April, the last thing MLB needs is to drag on some more.