I'LL play the devil's advocate, while I believe that Insomniac will stick with sony for the forseeable future, I am also very confident that Sony will not be buying them out anytime soon for the following reason:
1) Sony is in a financial crisis that is forecast to last for at least another 2 years. Why would they add to their burden by buying a company that are very happily independent but work exclusively through them?
2) The founder of Insomniac (which others have stated is a privately owned small bussiness) has stated very firmly in the past that while they enjoy their relationship with Sony, they are and will remain an indepedent company, a hostile takeover will most likely see Sony lose some key talents, and what is a ip-less studio without its talent?
3) Insomniac might not be big but when assessing a company, you not only consider its physical worth but also its profitability, insomniac is a very profitable company and this will reflect in its value.
