I would also like to remind everyone that even with a 10-15% stake in a company (i.e., not even close to majority), an activist investor/organization (think Charles Icahn) can cause major changes to a company via it's board of directors/governors. Keeping 51% of the shares in the hands of one owner (or even a few), while preventing the risk of a hostile takeover by another group like EA doesn't magically make everyone else a silent partner in the venture either. That's the danger people keep alluding to...
Personally, I think an IPO could be good for Paradox, it really can infuse a lot of cash into an operation, and as long as shareholder expectations can be managed (via regular dividend pay outs and clear long-term growth potential in terms of sales and otherwise) companies do tend to be left alone.
I wonder what kind of IPO price they'd be shooting for and how much stock they'll issue (i.e., a conservative price to earnings ratio of 12, a moderate 15, aggressive 19? Unicorn-land style 100?) + what they expect their market cap to be (I know, all inter-related calculations...)