Hey, this Missional thing is nothing new!  Listen to what the old English Puritan, John Owen, wrote in the 17th Century:

God has work to do in this world; and to desert it because of its difficulties and entanglements, is to cast off His authority. It is not enough that we be just, that we be righteous, and walk with God in holiness; but we must also serve our generation, as David did before he fell asleep. God has a work to do; and not to help Him is to oppose Him.

Missional may be a relatively new term coined to challenge an apathetic or directionless church, but it is not new.  It is the living out our biblical mandate.  God has work to do in this world – and in this community.  If we are in Christ we are enlisted to be as seeds scattered wherever our Sovereign God determines to send us, to take root and bless our generation.  (See Jeremiah 29.4-7)