Personally I like 3T's current offerings but talking of Cofidis, they tried single ring (with no FD) once for TT's. Everyone's chain fell off so I hope they have a chain catcher...
Hasn't someone (Tony Martin?) been riding a single front ring at current year GT's TT stage? It was discussed at LFGSS as well, and everyone concluded it was more chainline reasons rather than anything else. However, if it was Martin indeed, I can see why his chain did not fall off...
Seems 1 by 11 is joining the peloton next year:
http://www.cyclingweekly.com/news/product-news/aqua-blue-sport-ride-innovative-3t-strada-aero-bike-2018-352123