the umpire crew chief can make the call after 30 minutes, but he can also decide to wait if there is a clearing coming. my guess is, if the forecast is for ~90 minutes of rain, they'll wait it out and resume it
can the league afford to expand to more cities without a better revenue sharing system, and if not, would the current owners vote to allow more teams in the league if they had to spend more to support them? I also wonder exactly how much MLB's blackout rules negatively affect the fanbases and revenue of teams because of a lack of national exposure.