A lot will depend on the turf condition at Longchamp.
Workforce hasn't been disgraced in any of his races this season by any means. But that said, Workforce also doesn't look nearly the same horse as a 4yr.old that we saw smash the Epsom Derby record and win the Arc as a 3yr.old. In my opinion, you're just throwing $$$ away if you're backing Workforce for a repeat Arc win this year. Sarafina, So You Think, Galikova, Snow Fairy, Reliable Man, and possibly even St Nicholas Abbey are all likely to get home ahead of Workforce at Longchamp this year, IMO.