The question is, can you miss something you never really had? I suppose it's pretty much like telling me I can never eat fish again; I know it's good for me, and some even argue the fact that it is quite delicious. Still I hardly ever eat it, so my life would go on and I think I would survive if I only remember to buy some D-vitamins.
Pogba never played a vital part in our team, and thus he will not be missed. When you leave as a 19 year old, your heart is not in the club, and thus you will never be one of the truly great players!
But you have to give the lad a chance. Imagine applying that logic to the class of '92