Switzerland also have Yves Allegro and Stanislas Wawrinka but still, that's true Roger is a bit "alone".
Still, he has taken his team to the semis last year and the problem is, Seb vs Roger will be first match on Sunday. That means that even if it's 1all on Friday night, France better win the doubles to have a chance to beat the Swiss #2 again on Sunday's second match.
Of course it may turn out to be 2/0 on Friday for France
or Seb will manage to beat Roger, you never know.
But we're not there yet. Let's wait to see who will be fit and what surface will be chosen. I think Arnaud would deserve to play though.