I don't know that.
When I say the right time, I'm not talking about a certain opponent, but more about the youngster himself. None of us here have any real idea about the development our (current) youngsters have gone through so far, so I honestly can't say it is or isn't the right time.
That being said, our attacking play has been underwhelming so far, so changes are very much needed. And since those changes can't be carried out with senior players (due to injuries), the people in charge should at least think about certain youngsters.
Look, we all know this is an endless discussion, but the fact remains that none of our (so called) great youth talents have turned out to be great players.
So, was it indeed the wrong decision that we never gave them chances or relied on them?