I literally just got DirecTV this season just so I can watch the most hockey in HD.....
If they do hold out on each other and they take the FSN feeds off Center Ice. I'm looking for a refund of CI but still keeping the CI feeds. Either that or I'm looking at having Game Center for free provided by DirecTV until the dispute is over. I gave them my money with the promise to provide up to 40 out of market games a week. If they drop FSN's from the CI package that will make significant less amount of games per week. I look at that on the bases of false advertisement. So I'll be a little shocked if they drop the FSN from CI as they could get themselves in trouble.
What they would probably do and other has suggested is broadcast in SD for the FSN feeds. I think I read on this thread or another when Dish Network had their dispute with Fox that, that is what they did.
Honestly though I think (hope) that they will work this out before Nov. 1st or shortly after, and neither one of them wants to not have each other. DirecTV has 50 million subscribers and Fox doesn't want to loose all those people, and Fox provides a lot sports coverage as well as FX and sport coverage is DirecTV strongest selling point. If they lose FSN's they would be the worst at sports coverage.
For example in Los Angeles (2nd biggest market in the US) You would lose the Kings, Ducks, Lakers, Clippers, Angels, Dodgers, UCLA, USC, Galaxy, Chivas... Everything!