The catholic church cannot continue as it is, because very few men are becoming priests. Some parishes have married deacons carrying out Sunday services. The deacons miss out the transubstantion part of the service, and give out ready consecrated bread and wine. This is probably the way that the catholic church is going to be in the future.
I think that the pope is trying to think ahead, to figure out a way to sneak in married priests. It is a pragmatic decision, either do this or the church ends.
Diocesan (parish) priests make a vow of celibacy and obedience, but not a vow of poverty. They are permitted to own possessions, but are encouraged to live frugally - It would not be acceptable to take a second job as a hedge fund manager, but would be permitted to work as a teacher, counsellor etc. Priests attached to a holy order do take a vow of poverty, as do monks and nuns.
I'm not sure how easy it would be to have married priests. I do not know how the C of E manages it! How can vicars earn enough to support a family unless there is a FT working non-priest in the family?