First, the idea that people attending the OF Mass don’t believe in the True Presence of Our Lord and that the Holy Mass is a Sacrifiece. Statistics do show that many Catholics don’t believe in the True Presence and the Sacrifice of our Lord, but…many Catholics DO believe!!
Second, that being an altar boy in the OF Mass would create a rise of young men going into the priesthood. Young men decide to become a priest because they receive a call from the Lord and they answer that call in the affirmative. They don’t receive a call from the Lord because they are altar boys.
Third, that not being allowed to perform a service for the Lord in the Mass would be “awesome.” Many people who love serving the Lord and His people would be saddened, not awe-inspired.
Finally, you are assuming that “If certain changes are made…then Catholics will believe.” When Jesus walked on this earth, plenty of people witnessed His miracles, His messages, His loving actions and words–and they STILL didn’t believe.