As somone who does system conversions for a living, I could tell you stories that would make you absolutely cringe about how things can go wrong.

I'm sure they're not exactly happy with the ongoing issues, but put the impact of this in perspective. What is not functional? People's online access to their FF accounts.

--Customers can still use the website for all other functionality
--Customers can still access their FF information via the phone at no cost
--There is no impact on any of their delivery channels for selling the product
--There is no impact on the operation

It certainly isn't a good thing, and it doesn't reflect well on the image of the company. And the longer there are problems the more unhappiness there will be. But this isn't the type of event that costs them sales or creates havoc at the airport.