Interesting idea, not sure it would fly though. Part of the problem with that it is a more accurate barometer for how good a team is at the end of the season, not halfway through it. The MWC Tourney is the build up or climax to the season where everyone feels like they still have a chance even if their regular season was a bust. Without that endgame, I'm not sure teams would even put up much of a fight down the stretch run if they were out of it.
Kudos for thinking outside of the box!