Nice vort, but the Midrash doesn�t say that Mashiach is brought through this mitzvah. The Torah says shiluach haken gives long life. I read last week that a Midrash says that a woman without children should do shiluach haken, and in the merit of showing mercy to a mother, Hashem will grant her children.
Tanchuma also says that since it�s followed by pesukim about getting married and building a house, it�s also a segulah for those.
One other thing I read is that it�s not supposed to be planned. It�s supposed to be a happenstance – you find a nest. It shouldn�t be a nest that you know is there, where you go specifically to do the mitzvah. It needs to be unplanned.
