Not likely to happen. It is a very expensive and difficult process to get a new airframe FAA certified to carry commercial passengers, which is part of why the Dreamliner took so long to be delivered. Couple that with basically zero margin for airlines and you have a perfect storm of "it's really expensive to make a new plane and no one will pay for it if you do".
There's a reason you see so many 20+ year old CRJ-900s and MD-80/90s at the airport. Airlines literally cannot afford new planes, and aircraft makers can't get new airframes through the regulator process easily enough. Boeing struggled to get fly-by-wire to pass FAA regulations, how do you think they'd fare trying to replace aluminum with 3D printed plastic?