Yes, Catholics are ubiquitous
.
It is common for American Catholics to think of the Church in terms of the Church in America. But we often forget that the rest of the world (including the Vatican) does not look at it that way. Meaning, the rest of the world considers the Catholic Church in America to be a strange and bizarre entity living in its own reality. Before the last papal election, someone asked one of the American cardinal electors if there was a possibility we'd see an American pope. He very politely said no, not a chance
, and explained that it wouldn't be right to choose the pope from a country that was a superpower at the moment. A very diplomatic way of saying an American would not be representative of the whole Church.
So, for an issue like vocations, Americans look around and say
we have a problem. The rest of the Church looks at us and says, no,
you have a problem, we're doing just fine, thanks. It is very true that the number of priests being ordained right now (we only had two this year) and the number of priests retiring means that the US is having trouble staffing all its parishes. There are parishes without priests now, and the situation is likely to get worse, not better, in the near future. The same is true for Canada. But...the problems in Africa tend to be "our seminary is too small and we can't afford to expand it or accept all the young men who want to be priests." Similar in India. Latin America does not have a vocation crisis, so much as a distribution problem - all the priests are in the cities. France is the same way - about half the priests in France are in Paris. I don't pretend to understand why that is.
If the Vatican were to consider a change on the requirement of priestly celibacy, they would do so for other reasons,
not just because of the situation in America. They look at the world-wide Church when making such decisions. And realistically, it would be a very significant decision financially, because then the Church would be commiting to support not only the diocesan priests, but also their families.
And yes, I'm sorry, diaconate means deacons (the way priesthood means priests). Deacons are ordained, but they are not priests. So, they cannot say mass or hear confessions. Sacramentally, they can do baptisms and weddings. They can preach at mass (give the homily). Deacons cannot replace priests, in other words, but they can help out a diocese. They tend to have ministries that most priests do not have the time for - hospital or prison chaplains, for instance. Currently, being a deacon is considered a part-time job for retired men. (So, it does exist already, though not all dioceses have the program.) It is also (as
Alatar pointed out) a step on the way to becoming a priest for a seminarian.