I've been a big proponent of 15/15 with interleague throughout the season for several years, but getting rid of WC isn't going to happen. This isn't 1966, there are 30 teams, limiting the playoffs to just 6 just doesn't fly. It would eliminate the vast majority of teams from contention by August and drive down attendence + ratings. To add value to winning the division, I'd add a WC team in each league. Have the 2 WC teams play a 1 game playoff (great TV) for the right to play the #1 seed, and then the 2 and 3 face each other. This gives the team with the best record the benefit of facing a lesser team, presumably with a less than ideal starting rotation for the first round. As for the interleague, I would stick with 1 "rival" series - rotating home and away every year - then try and match up teams with similar rankings from the previous year. The two WS teams would play each other, perhaps on opening day, or maybe right before or after the ASB. The two LCS losers would face each other, and I'd also save the matchups between the worst teams for the end of the season to try and limit the amount of "interleague games determining the division down the stretch" complaints as well as maybe keeping the potential WS teams from facing each other a couple weeks before the WS.