Thats a heck of an assumption. Again OSers always argue that EA is all about the money and that EA doesnt waste an opportunity to generate revenue. If thats the case and the market was really there, EA would release the game on PC. The market is there internationally and they release FIFA on PC every year.
The safer assumption is that EA's looked in to this and doesnt think the market is there. That assumption is supported by the comments EA has stated over the past few years about Madden on PC.