BD, you left out the most important thing: what +Peter said was what all the Apostles expected: they were convinced they were facing the end-opf-times apocalypse. +Peter was quoting Prophet Joel, not making long term plans for evangelism:
But we all know that Prophet Joel's prophesy did not apply, did it?
The people were accusing the gathered 150 disciples on whom the Holy Spirit had descended upon and accused them of being drunk. Peter’s response was that this enthusiasm was the fulfillment of Joel’s prophecy.
“But Peter, standing up with the eleven, lifted up his voice, and said unto them, Ye men of Judaea, and all ye that dwell at Jerusalem, be this known unto you, and hearken to my words: For these are not drunken, as ye suppose, seeing it is but the third hour of the day. But this is that which was spoken by the prophet Joel; And it shall come to pass in the last days, saith God, I will pour out of my Spirit upon all flesh: and your sons and your daughters shall prophesy, and your young men shall see visions, and your old men shall dream dreams: And on my servants and on my handmaidens I will pour out in those days of my Spirit; and they shall prophesy:”
So, yes that portion of the prophecy was being fulfilled in their presence.