Yes, allowing priests to marry would increase vocations, because more people would want to join the priesthood, knowing that marriage is an option. Allowing priests to marry would also likely cut down on the amount of abuse perpetuated by priests. This would be a positive development, because more people would consider serving the church in this manner.
It is likely that many men do not become priests because they have sexual desires that are not allowed in the priesthood. To allow priests to marry would encourage more priests. There would also be less issues with child molestation by priests. Whether or not more religion is a good thing is a different question.