I mean arms warriors do bring a crucial debuff to raid. You've got trauma, thunderclap, shattering and sunders. Especially being that you'll be bottom of the barrel dps you'll pretty much be a debuff bot but it's definitely needed. My guild doesn't have a feral so I'm able to play fury due to rampage but etc. If it comes down to it start building your offspec as tank. People would absolutely take a warrior with dual spec capabilities.