I'll second everything that Agrarian has said with just a couple of observations. First, I would think that instead of Patriarchies, you'd have Eparchies of the Throne of +Peter, headed by a Cardinal Archbishop appointed by Rome and administered by an Eparchial Synod of some sort, probably made up of Metropolitans but perhaps all the bishops would be in it. That might get awfully large and cumbersome, though. My big fear would be that since the Roman Catholic laity has had no role to speak of beyond "pay, pray and obey" in the Church for 1000 years or more, especially such a role as would make it natural for them to act as the watch dogs of the orthodoxy of the hierarchs, heresy would crop up and firmly root itself very quickly. Your laity, as a general rule, wouldn't know heresy or the near occasion of the same if it hit them in the face, which it is every week in some dioceses, and even when they do see it, they don't seem to care. Rome has shown itself reluctant to remove unorthodox people like +Mahoney even under the present system. Under even what I have suggested, let alone under separate Patriarchates, removal might be even harder and less likely to happen. Someone or some position like a Grand Inquisitor (seriously, ninenot, with all due respect!) would have to be established to assure orthodoxy in the absence of the peer pressure which the 1800 year old Orthodox system generally insures. What would your liberal fellow communicants think of that? Frankly, though such a system looks great at first glance, it wouldn't work for the Roman Church and it would be very, very bad for any hope of improved relations with Orthodoxy. Who would we talk to? It will take a couple of hundred years of catechesis and at least a few major schisms in the Western Church before it will be ready for an Orthodox type system. I have great confidence in +Benedict XVI; I think most Orthodox who have noticed do too, but this is just a bad idea whose time has definitely not come.
Seriously, Kolo, we are ready, willing, and (if not perfectly,)--ABLE!
Our Grand Inquisitor (BlackElk, who has not accepted the nomination) will be delighted to meet with you regarding the details.