I fail to imagine how Sprague's infrastructure can handle 3.4 billion (the equivalent of Cambridge for example) people considering it likely wasn't planned to host that many and it was only a decade anyway to do so anyway. Dumping billions of people apparently into the middle of nowhere equals killing at least half of them. Sprague makes very little sense, considering there are other houses to flee or to Bretonia planets where infrastructure actually exists.
Houses spent centuries building infrastructure on planets that host billions. Here it happened instantly. Bretonia expansion to omegas is cool and I like the concept. But Sprague is probably the worst implementation of the whole thing.
This is too much even for grotesque universe freelancer is. It still has some rules and basic parameters set that you operate with. Making a complete planet with nothing into a multi-billion planet literally overnight is an overkill.
Before someone brings hospitals on Earth being built for a few weeks, it's mostly because you have factories, food production, medical facilities, housing, and everything is in likely a few hundred km away, not in another solar system with the not very secured route to it. Earth has said infrastructure already, and so other proper planets that refugees would likely run to. In Bretonia it's currently New London and Cambridge, I think it would be cool if some Bretonian refugees went to other Houses too.
Infrastructure projects are usually the most expensive investments, which I doubt Bretonia made, considering their main industrial hub (Leeds) was captured and everything went on the war effort. And later Leeds was just destroyed.
The solution is to obviously spread this population among some planets in Bretonia, Rheinland, and Liberty. It would make sense for some refugee population from other Bretonian planets to move into other Houses, it's weird that they are being tightly contained in Bretonia, not like they can bring any profit to Bretonian government in such amounts, but leech funding. I think a realistic number of the population would be on pair with Yuma or Gran Canaria with steady colonization and an increase of it to a greater number.
Now with Durandal gone, I hope we can fix weird things as opposed of them being forced.