Would God allow all of humanity to be celibate?
The short answer is no.
This goes directly against what God said to Adam:
28 And God blessed them, and God said unto them, Be fruitful, and multiply, and replenish the earth, and subdue it: and have dominion over the fish of the sea, and over the fowl of the air, and over every living thing that moveth ...
The Fathers have opined on the question of whether God would allow the entire human race to become celibate.
St. Gregory of Nyssa (370 A.D.)
St. Gregory of Nyssa thought that if all of mankind embraced continence, then God would create new humans in a manner similar to how he created Adam, out of the earth. St. Thomas Aquinas summarizes St. Gregory's view ...