Good luck finding a 3x11 system. The whole idea of compact cranks and 11-speed is to eliminate the need for the third chainring.

To upgrade to 2x11 you will need front and rear derailleurs, front and rear shift/brake levers, and a new rear wheel. Unless you want to futz around with finding and installing an 11-speed freehub body, rearranging the hub spacers, and re-dishing the wheel. Ask yourself if losing 5 (theoretical) gearing combinations is worth the expense and bother.