I hope the Missouri Synod churches are ready for the influx.
Seems to me, though, that not many people will leave. There's an organization of liberal Lutherans who want to remain true to their heritage (Lutheran CORE) but, at the end of the day, I don't think they identify with LCMS. Those folks are more likely to form their own associations.
It's just as well. If there were a great influx, they'd just "re-invent" the LCMS and spoil it within a generation.