Actually, it won't be giving it up.
Celibacy will be embraced by those who are called to it, and those with ambition to the episcopacy. I don't realistically think the Church would do anything more than adopt the Eastern Rite practice, which is married priests, and celibate bishops.
Celibacy is simply not something that most men are called to.
And, yes, I think there are EASILY 4,000 married deacons who would go on to the priesthood. And, given the position many of the more mature men are in, it would NOT be a financial burden on the Church.