Its not just that, PSN goes down for maintenance often. Its not a huge deal, but if that happens you can't play your franchise that night. That could be frustrating, especially if you don't have a lot fo time to play. Your own internet could go down, or your router could break. I've gone through multiple routers and have no wifi for days while I get a new one.
Its a legitamate concern, but not as big as Perfect Zero is making it out to be. Think about every other game ever. Think about a game like Titanfall, Xbox Live was having major issues when it came out and will go down again in the future, either due to maintenance or malfunction, during that time Titanfall is unplayable. That sucks, but its part of online gaming. Its something that Perfect Zero just needs to accept as being part of taking franchise online. If it is going to involve multiple users you can't have multiple save files or else everyone in the league would need to sync their file every time someone changes anything.
Its why there needs to be parity between the modes, if they are both being called Franchise. The difference between online and offline should be multiplayer (and internet required features) or single player. If that was the case there wouldn't be as many issues with the changes.