Personally I'm hoping for some major lawsuits to come of things like this, and start finally hammering down the EULAs. I doubt this will be where the line is drawn though.
One thing I've always pointed out is that people paying real money for virtual property is a touchy thing, especially seeing as it's been defended as this non-existant property having value based on context and what people ascribe to it. Video games at their current level of development can't exist indefinatly, and with all of the microtransaction fueled games out there, especially "free to play" ones that you can jump in and out of, it's inevitable that they are going to start to go down, probably in clusters as many of them reach their "twilight" at the same time.
I know the companies ARE covered by their EULAs, or so they think, but there is going to rapidly be a question as to people with hundreds or thousands of dollars invested in these games who stay committed until the end, losing all the time and money they put into the product especially if they still want to play, or simply if they liked the idea that they could play anytime they wanted and have their virtual property waiting for them.
With a failure of a game like Civworld, I don't see much of an issue here, but when I look at people simply losing their "Civbucks" and/or whatever was purchused with them I see the beginning of a trend that is going to be interesting if people get mad enough when a company like Funcom goes down (in the middle of a huge crash), or perhaps worse yet "Perfect World" given that right now Star Trek Online seems to have risen from the grave to become a bigger success than City Of Heroes (Cryptic's former leading game) ever was, I myself put a decent chunk of change into AoC/TSW/STO/CO between those companies and I know people who have literally purchused everything in the respective online stores for those games.
I think we might be in for an interesting few years, and to be honest I think the goverment should introduce legislation requiring any kind of game with microtransactions to be backed by a trust fund that generates enough interest to ensure the operation and maitnence of servers indefinatly even if the company otherwise expires.